Werkzeug is a comprehensive WSGI web application library. Prior to version 2.2.3, Werkzeug's multipart form data parser will parse an unlimited number of parts, including file parts. Parts can be a small amount of bytes, but each requires CPU time to parse and may use more memory as Python data. If a request can be made to an endpoint that accesses request.data, request.form, request.files, or request.get_data(parse_form_data=False), it can cause unexpectedly high resource usage. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. Unlimited file parts can use up memory and file handles. If many concurrent requests are sent continuously, this can exhaust or kill all available workers. Version 2.2.3 contains a patch for this issue.
CVE-2023-25577
“—” beside the score: it is equal to NVD's CVSS score.
This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 1.4% (72nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 49EG Risk 49/100
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)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation1.4% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability100% × 15%CISA's SSVC Automatable value: yes (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high. - EPSS PROB
- 1.4%
- EPSS %ILE
- 72nd
- 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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
- EG Likelihood
- 1.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-20). 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; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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; Attend at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable yes (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
February 14, 2023
Last Modified
November 21, 2024
References (5)
- security-advisories@github · CVE Programhttps://github.com/pallets/werkzeug/commit/517cac5a804e8c4dc4ed038bb20dacd038e7a9f1Patch
- security-advisories@github · CVE Programhttps://github.com/pallets/werkzeug/releases/tag/2.2.3Release Notes
- security-advisories@github · CVE Programhttps://github.com/pallets/werkzeug/security/advisories/GHSA-xg9f-g7g7-2323Vendor Advisory
- security-advisories@github · CVE Programhttps://security.netapp.com/advisory/ntap-20230818-0003/
- security-advisories@github · CVE Programhttps://www.debian.org/security/2023/dsa-5470
Vendor Advisories for CVE-2023-25577(5)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2025:9775Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ceph Storage 8.1 security, bug fix, and enhancement updates
- RHSA-2025:4664Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ceph Storage 7.1 security, bug fix, and enhancement updates
- RHSA-2023:7341Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Quay security update
- RHSA-2023:1325Red Hat Product SecurityHigh
Red Hat Security Advisory: OpenShift Container Platform 4.13.0 security update
- CVE-2023-25577Microsoft Security Response Center (MSRC)High
Werkzeug may allow high resource usage when parsing multipart form data with many fields
Patch Availability(11)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | python-werkzeug-doc (0.10.4+dfsg1-1ubuntu1.2+esm1) @ xenial | 2026-10-21 | ubuntu |
| ubuntu | python-werkzeug-doc (2.2.2-2ubuntu0.1) @ lunar | 2026-10-21 | ubuntu |
| redhat | oath-toolkit-0:2.6.12-1.el9cp | 2025-06-26 | redhat |
| redhat | oath-toolkit-0:2.6.12-1.el8cp | 2025-05-07 | redhat |
| redhat | quay/quay-rhel8:v3.10.0-150 | 2023-11-30 | redhat |
| redhat | python-werkzeug-0:2.2.3-2.el9 | 2023-11-29 | redhat |
| redhat | python-werkzeug-0:1.0.1-3.el8ost | 2023-05-18 | redhat |
| redhat | python-werkzeug-0:2.0.3-5.el8 | 2023-04-19 | redhat |
| redhat | python-werkzeug-0:2.0.3-4.el9 | 2023-04-03 | redhat |
| redhat | python-werkzeug-0:0.14.1-12.el8ost | 2023-03-15 | redhat |
| redhat | python-werkzeug-0:2.0.1-5.el9ost | 2023-02-28 | redhat |
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
(6 across 6 ecosystems)
Debian:10(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-werkzeug | 0.14.1+dfsg1-4, 0.14.1+dfsg1-4+deb10u1 |
| — |
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-werkzeug | 1.0.1+dfsg1-2 |
| — |
Debian:12(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-werkzeug | — |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-werkzeug | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python-werkzeug | — |
| — |
PyPI(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| werkzeug | 0.1 ... 2.2.2 (80 versions) |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Additional Vendor Advisories
(7)
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 HatRHBA-2023:1507IMPORTANT2023-02-14
RHBA-2023:1507 — Important
- Red HatRHBA-2023:1759IMPORTANT2023-02-14
RHBA-2023:1759 — Important
- Red HatRHSA-2023:1018IMPORTANT2023-02-14
RHSA-2023:1018 — Important
- Red HatRHSA-2023:1281IMPORTANT2023-02-14
RHSA-2023:1281 — Important
- Red HatRHSA-2023:7473IMPORTANT2023-02-14
RHSA-2023:7473 — Important
- UbuntuUSN-5948-1MEDIUM
Werkzeug vulnerabilities
- UbuntuUSN-5948-2MEDIUM
Werkzeug vulnerabilities
Data Freshness Timeline
(refreshed 10× in last 7d / 36× 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 93 of 201 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. 7 repeat rows among the latest 100 are merged into the row they repeat. The 108 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 1.4% · 72nd percentile
- 2026-10-22 16:30 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-21 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-21 04:44 UTCEG score recompute
- 2026-10-21 04:44 UTCVendor advisory
- 2026-10-20 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-19 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-18 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-18 08:10 UTCEG score recompute
- 2026-10-17 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-16 16:35 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-15 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-14 21:54 UTCOSV refresh
- 2026-10-14 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-13 16:29 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-12 18:33 UTCEG score recompute
- 2026-10-12 16:30 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-11 21:57 UTCEG score recompute
- 2026-10-11 13:45 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-10 19:57 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-09 20:05 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-08 17:05 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-07 23:45 UTCEPSS rescoreEPSS 1.4% · 72nd percentile
- 2026-10-06 15:14 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-05 17:40 UTCEPSS rescoreEPSS 1.4% · 71st percentile
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- 2026-10-04 23:19 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-03 14:23 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-02 16:23 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-10-01 19:47 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-30 16:18 UTCEG score recompute
- 2026-09-30 15:01 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-29 15:16 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-26 15:55 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-26 00:22 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-24 14:01 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-23 20:41 UTCOSV refresh
- 2026-09-23 13:45 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-22 14:45 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-20 20:14 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-19 15:38 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-18 19:25 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-17 19:24 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-16 14:05 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-16 05:11 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-15 03:07 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-12 14:58 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-11 09:34 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-08 21:57 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-07 15:59 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-06 13:45 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-05 15:25 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-09-04 15:24 UTCOSV refresh
- 2026-09-04 13:57 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-04 05:04 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-02 14:09 UTCEPSS rescoreEPSS 1.4% · 71st percentile
- 2026-09-01 13:51 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-30 19:15 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-30 01:19 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-28 21:38 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-27 14:22 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-26 14:43 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-25 13:46 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-24 14:14 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-23 00:17 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-21 23:46 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-20 22:53 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-19 17:01 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-18 13:46 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-18 02:34 UTCOSV refresh
- 2026-08-17 13:44 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-16 14:53 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-16 02:12 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-15 01:27 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-13 21:58 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-12 13:48 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-09 13:44 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-08 16:34 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-07 16:24 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-06 13:44 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-05 19:15 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-04 15:07 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-04 10:35 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-03 10:34 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-02 21:27 UTCOSV refresh
- 2026-08-02 02:24 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-08-01 04:13 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-07-30 16:26 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-07-30 01:28 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-07-28 15:34 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-07-26 14:52 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-07-25 14:16 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-07-24 14:15 UTCEPSS rescoreEPSS 1.4% · 70th percentile
- 2026-07-23 14:16 UTCEPSS rescoreEPSS 1.4% · 70th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:10:python-werkzeug · Debian:11:python-werkzeug · Debian:12:python-werkzeug
Same vendor
10 shownredhat:RHSA-2023:1018 · redhat:RHSA-2023:7473 · redhat:RHSA-2025:4664
Frequently asked(5)
What is CVE-2023-25577?
When was the CVE record for CVE-2023-25577 published?
Is CVE-2023-25577 actively exploited?
What is the CVSS score of CVE-2023-25577?
How do I remediate CVE-2023-25577?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2023-25577
Is Your Infrastructure Affected by CVE-2023-25577?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.