An issue in “Zen 2” CPUs, under specific microarchitectural circumstances, may allow an attacker to potentially access sensitive information.
CVE-2023-20593
MEDIUMNVD 5.55.5ElevatedEG-KEV Tier 3: ElevatedEG-KEV is EchelonGraph's own tiering of exploitation signals from CISA KEV, CISA's SSVC data (Vulnrichment), ransomware data, public exploit-code references and EPSS.Tier 3 is not evidence of exploitation. It means public exploit code is referenced, or CISA's SSVC data says "public PoC", or EPSS ranks the CVE in the top 5%.Signals for this CVE: CISA's SSVC exploitation value: public PoC, other public exploit code (a GitHub or vendor proof of concept, or an Exploit-DB entry not marked verified).First public exploit code on record: 2023-07-26 (GitHub PoC sbaresearch/stop-zenbleed-win)EchelonGraph confidence 42%: a heuristic from the tier and the number of signals, not a measured probability.
EchelonGraph scoreMEDIUM confidence
“—” beside the score: it is equal to NVD's CVSS score.
This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 5.2% (92nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
5.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
- Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 5.2%CVSS: 5.5Exploit: Public PoCExposed services: Not assessed
A fix is available — apply it.
- CVSS v3
- 5.5
- EG Score
- 5.5MEDIUMmedium confidence
- EG Risk
- 41EG Risk 41/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity55% × 45%Impact severity (EG Severity): CVSS 5.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation40% × 40%EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 5.2%
- EPSS %ILE
- 92nd
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 5.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
July 24, 2023
Last Modified
February 13, 2025
References (35)
- psirt@amd · CVE Programhttp://seclists.org/fulldisclosure/2023/Jul/43Not Applicable
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/24/3Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/1Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/12Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/13Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/14Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/15Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/16Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/17Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/5Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/25/6Mailing List
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/26/1Mailing List · Mitigation · Patch · Third Party Advisory
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/07/31/2Mailing List · Mitigation · Patch · Third Party Advisory
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/08/08/6
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/08/08/7
15 of 35 shown · show the other 20
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/08/08/8
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/08/16/4
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/08/16/5
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/09/22/11
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/09/22/9
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/09/25/4
- psirt@amd · CVE Programhttp://www.openwall.com/lists/oss-security/2023/09/25/7
- psirt@amd · CVE Programhttp://xenbits.xen.org/xsa/advisory-433.htmlMitigation · Patch · Vendor Advisory
- psirt@amd · CVE Programhttps://cmpxchg8b.com/zenbleed.htmlExploit
- psirt@amd · CVE Programhttps://lists.debian.org/debian-lts-announce/2023/07/msg00030.htmlMailing List
- psirt@amd · CVE Programhttps://lists.debian.org/debian-lts-announce/2023/07/msg00033.htmlMailing List · Third Party Advisory
- psirt@amd · CVE Programhttps://lists.debian.org/debian-lts-announce/2023/08/msg00001.html
- psirt@amd · CVE Programhttps://lists.fedoraproject.org/archives/list/[email protected]/message/CP6WQO3CDPLE5O635N7TAL5KCZ6HZ4FE/
- psirt@amd · CVE Programhttps://lists.fedoraproject.org/archives/list/[email protected]/message/HKKYIK2EASDNUV4I7EFJKNBVO3KCKGRR/
- psirt@amd · CVE Programhttps://lists.fedoraproject.org/archives/list/[email protected]/message/SD2G74BXS2SWOE3FIQJ6X76S3A7PDGML/
- psirt@amd · CVE Programhttps://security.netapp.com/advisory/ntap-20240531-0004/
- psirt@amd · CVE Programhttps://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-7008Vendor Advisory
- psirt@amd · CVE Programhttps://www.debian.org/security/2023/dsa-5459Third Party Advisory
- psirt@amd · CVE Programhttps://www.debian.org/security/2023/dsa-5461Third Party Advisory
- psirt@amd · CVE Programhttps://www.debian.org/security/2023/dsa-5462Third Party Advisory
Vendor Advisories for CVE-2023-20593(8)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2023:7557Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security and bug fix update
- RHSA-2023:7382Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security and bug fix update
- RHSA-2023:7389Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel-rt security update
- RHSA-2023:5244Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security, bug fix, and enhancement update
- RHSA-2023:5255Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel-rt security and bug fix update
- RHSA-2023:5069Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security, bug fix, and enhancement update
- RHSA-2023:5091Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel-rt security and bug fix update
- RHSA-2023:4789Red Hat Product SecurityHigh
Red Hat Security Advisory: kernel security, bug fix, and enhancement update
Patch Availability(30)
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(21 across 15 ecosystems)
Debian:10(3)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| amd64-microcode | 0.20120117-1 ... 3.20230414.1 (38 versions) |
| — |
| linux | 4.19.118-1 ... 4.19.98-1~bpo9+1 (43 versions) |
| — |
| linux-5.10 | 5.10.136-1~deb10u1 ... 5.10.179-1~deb10u1 (8 versions) |
| — |
Debian:11(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| amd64-microcode | 0.20120117-1 ... 3.20230719.1~deb10u1 (39 versions) |
| — |
| linux | 5.10.103-1 ... 5.10.92-2 (30 versions) |
| — |
Debian:12(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| amd64-microcode | 0.20120117-1 ... 3.20230719.1~deb11u1 (40 versions) |
| — |
| linux | 6.1.27-1, 6.1.37-1, 6.1.38-1, 6.1.38-2~bpo11+1 |
| — |
Debian:13(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| amd64-microcode | 0.20120117-1 ... 3.20230719.1~deb12u1 (41 versions) |
| — |
| linux | — |
| — |
Debian:14(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| amd64-microcode | 0.20120117-1 ... 3.20230719.1~deb12u1 (41 versions) |
| — |
| linux | — |
| — |
Alpine:v3.15(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.16(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.17(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.18(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.19(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.20(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.21(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.22(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.23(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Alpine:v3.24(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| xen | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(17)
Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.
- Red HatRHSA-2023:4696MODERATE2023-07-25
RHSA-2023:4696 — Moderate
- Red HatRHSA-2023:4699MODERATE2023-07-25
RHSA-2023:4699 — Moderate
- Red HatRHSA-2023:4819MODERATE2023-07-25
RHSA-2023:4819 — Moderate
- Red HatRHSA-2023:4821MODERATE2023-07-25
RHSA-2023:4821 — Moderate
- Red HatRHSA-2023:5068MODERATE2023-07-25
RHSA-2023:5068 — Moderate
- Red HatRHSA-2023:5245MODERATE2023-07-25
RHSA-2023:5245 — Moderate
- Red HatRHSA-2023:5419MODERATE2023-07-25
RHSA-2023:5419 — Moderate
- Red HatRHSA-2023:5591MODERATE2023-07-25
RHSA-2023:5591 — Moderate
- Red HatRHSA-2023:5607MODERATE2023-07-25
RHSA-2023:5607 — Moderate
- Red HatRHSA-2023:7244MODERATE2023-07-25
RHSA-2023:7244 — Moderate
- Red HatRHSA-2023:7401MODERATE2023-07-25
RHSA-2023:7401 — Moderate
- Red HatRHSA-2023:7513MODERATE2023-07-25
RHSA-2023:7513 — Moderate
- Red HatRHSA-2023:7551MODERATE2023-07-25
RHSA-2023:7551 — Moderate
- Red HatRHSA-2023:7665MODERATE2023-07-25
RHSA-2023:7665 — Moderate
- Red HatRHSA-2023:7782MODERATE2023-07-25
RHSA-2023:7782 — Moderate
- Red HatRHSA-2024:0402MODERATE2023-07-25
RHSA-2024:0402 — Moderate
- Red HatRHSA-2024:0403MODERATE2023-07-25
RHSA-2024:0403 — Moderate
Data Freshness Timeline
(refreshed 8× in last 7d / 33× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 94 of 197 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 6 repeat rows among the latest 100 are merged into the row they repeat. The 103 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-23 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-22 16:30 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-21 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-20 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-19 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-18 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-18 08:15 UTCEG score recompute
- 2026-10-17 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-16 16:35 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-15 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-14 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-13 16:29 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-13 10:24 UTCOSV refresh
- 2026-10-12 18:38 UTCEG score recompute
- 2026-10-12 16:30 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-11 22:01 UTCEG score recompute
- 2026-10-11 13:45 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-10 19:57 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-09 20:05 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-08 17:05 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-07 23:45 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-06 15:14 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-05 17:40 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-04 23:19 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-03 14:23 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
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- 2026-10-02 16:23 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-10-01 19:47 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-30 16:15 UTCEG score recompute
- 2026-09-30 15:01 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-29 15:16 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-26 15:55 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-26 00:22 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-24 14:01 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-23 13:45 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-23 04:50 UTCOSV refresh
- 2026-09-22 14:45 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-20 20:14 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-19 15:38 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-18 19:25 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-17 19:24 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-16 14:05 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-16 05:11 UTCEPSS rescoreEPSS 5.2% · 92nd percentile
- 2026-09-15 03:07 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-12 14:58 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-11 09:34 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-08 21:57 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-07 15:59 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-06 13:45 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-05 15:25 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-04 13:57 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-04 05:04 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-03 23:29 UTCOSV refresh
- 2026-09-02 14:09 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-09-01 13:51 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-30 19:15 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-30 01:19 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-28 21:38 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-27 14:22 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-26 14:43 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-25 13:46 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-24 14:14 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-23 00:17 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-21 23:46 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-20 22:53 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-19 17:01 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-18 13:46 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-17 13:44 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-17 12:32 UTCOSV refresh
- 2026-08-16 14:53 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-16 02:12 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-15 01:27 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-13 21:58 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-12 13:48 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-09 13:44 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-08 16:34 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-07 16:24 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-06 13:44 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-05 19:15 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-04 15:07 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-04 10:35 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-03 10:34 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-02 06:45 UTCOSV refresh
- 2026-08-02 02:24 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-08-01 04:13 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-30 16:26 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-30 01:28 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-28 15:34 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-25 14:16 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-24 14:15 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-23 14:16 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-23 02:18 UTCEG score recompute
- 2026-07-22 23:05 UTCEG score recompute
- 2026-07-22 14:06 UTCEPSS rescoreEPSS 5.2% · 91st percentile
- 2026-07-21 15:23 UTCEPSS rescoreEPSS 5.2% · 91st percentile
Publicly available exploits
(2 references)Public exploit code is referenced for this CVE (2 GitHub PoCs). Defenders should treat patch urgency accordingly.
- GitHub PoCjiegec/LoongBleedPublished May 12, 2026
LoongBleed (aka LoongLeak) is a hardware vulnerability similar to ZenBleed (CVE-2023-20593) affecting Loongson LA464/LA664 processors.
Open source ↗ - GitHub PoCsbaresearch/stop-zenbleed-winPublished Jul 26, 2023
PowerShell script to apply Zenbleed (CVE-2023-20593) MSR workaround on Windows
Open source ↗
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:11:amd64-microcode · Debian:10:amd64-microcode · Alpine:v3.15:xen
- CVE-2023-20569NVD 4.7EG 7.5EPSS p94HIGH
- CVE-2019-9836EG 5.3MEDIUM
- CVE-2024-36357EG 5.6MEDIUM
- CVE-2024-36350EG 5.6MEDIUM
- CVE-2017-10921EG 10.0CRITICAL
- CVE-2017-10920EG 10.0CRITICAL
- CVE-2017-10918EG 10.0EPSS p90CRITICAL
- CVE-2017-10912EG 10.0CRITICAL
- CVE-2016-9603NVD 5.5EG 9.9EPSS p91CRITICAL
- CVE-2017-2620NVD 5.5EG 9.9CRITICAL
Same vendor
10 shownredhat:RHSA-2023:5069 · ubuntu:USN-6315-1 · redhat:RHSA-2023:4789
Frequently asked(5)
What is CVE-2023-20593?
CVE-2023-20593 is a medium-severity vulnerability; its CVE record was published on July 24, 2023. An issue in “Zen 2” CPUs, under specific microarchitectural circumstances, may allow an attacker to potentially access sensitive information.
When was CVE-2023-20593 made public?
CVE-2023-20593 was made public on July 24, 2023: that is the date its CVE record's CNA, Advanced Micro Devices Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 24, 2023. EchelonGraph's copy of the record carries a last-modified date of February 13, 2025; the record at its source may have been updated since.
Is CVE-2023-20593 actively exploited?
CVE-2023-20593 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 5.2% probability of exploitation in the next 30 days (92nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2023-20593?
CVE-2023-20593 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2023-20593?
A fix for CVE-2023-20593 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2023-20593 are linked in the Vendor Advisories panel on this page.
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-20593
Is Your Infrastructure Affected by CVE-2023-20593?
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