CVE-2023-4693

MEDIUMNVD 4.65.3▲
EchelonGraph scoreMEDIUM confidence

Score 5.3 from GitHub Security Advisory published 2023-10-25. NVD baseline CVSS 4.6; sources differ by 0.7.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.6Exploit: None knownExposed: 0

A fix is available — apply it.

An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to be leaked, presenting a high Confidentiality risk.

CVSS v3
4.6
EG Score
5.3(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity53% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
40%
KEV
Not listed

Published

October 25, 2023

Last Modified

July 21, 2026

Advisory Details (7)

Auto-updated Jul 21, 2026
Patch available. Sources: redhat.
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2023-4693
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2024:3184
redhat Patch Available

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2024:2456
generic

oss-sec: CVE-2023-4692, CVE-2023-4693: grub2: OOB write, read via specially crafted NTFS filesystem

https://seclists.org/oss-sec/2023/q4/37
generic

[SECURITY PATCH 0/6] GRUB2 NTFS driver vulnerabilities - 2023/10/03

https://lists.gnu.org/archive/html/grub-devel/2023-10/msg00028.html
generic

CVE-2023-4692, CVE-2023-4693: vulnerabilities in the GRUB boot manager – My DFIR Blog

https://dfir.ru/2023/10/03/cve-2023-4692-cve-2023-4693-vulnerabilities-in-the-grub-boot-manager/
redhat Patch Available

2238343 – (CVE-2023-4693) CVE-2023-4693 grub2: out-of-bounds read at fs/ntfs.c

Affected: Red Hat Enterprise Linux 9

https://bugzilla.redhat.com/show_bug.cgi?id=2238343

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntugrub-efi-arm64-signed (1.193.2+2.06-2ubuntu17.2) @ lunar2026-05-24ubuntu
redhatgrub2-1:2.02-156.el82024-05-22redhat
redhatgrub2-1:2.06-77.el92024-04-30redhat

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

(5 across 5 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
grub22.02+dfsg1-20 ... 2.06-3~deb10u3 (43 versions)2.06-3~deb10u4—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
grub22.04-20 ... 2.06-3~deb11u5 (19 versions)2.06-3~deb11u6—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
grub22.06-132.06-13+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
grub2—2.12~rc1-11—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
grub2—2.12~rc1-11—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 9× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 130 total refreshes for this CVE.

  1. 2026-08-10 23:57 UTCEPSS rescore
  2. 2026-08-09 13:44 UTCEPSS rescore
  3. 2026-08-09 13:44 UTCEPSS rescore
  4. 2026-08-08 16:35 UTCEPSS rescore
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  14. 2026-08-01 23:06 UTCOSV refresh
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  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 02:27 UTCEG score recompute
  3. 2026-07-22 23:14 UTCEG score recompute
  4. 2026-07-22 14:06 UTCEPSS rescore
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  16. 2026-07-15 06:19 UTCOSV refresh
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  25. 2026-07-09 19:08 UTCEPSS rescore
  26. 2026-07-08 15:13 UTCEPSS rescore
  27. 2026-07-07 13:44 UTCEPSS rescore
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  37. 2026-06-30 23:21 UTCEPSS rescore
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  42. 2026-06-28 04:55 UTCEPSS rescore
  43. 2026-06-27 06:34 UTCOSV refresh
  44. 2026-06-27 03:07 UTCEPSS rescore
  45. 2026-06-25 13:48 UTCEPSS rescore
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  47. 2026-06-24 14:04 UTCEPSS rescore
  48. 2026-06-24 14:04 UTCEPSS rescore
  49. 2026-06-24 06:26 UTCNVD updateCVSS v3 → 4.6
  50. 2026-06-23 21:31 UTCEPSS rescore
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  71. 2026-06-10 22:17 UTCEPSS rescore
  72. 2026-06-10 13:21 UTCEPSS rescore
  73. 2026-06-09 17:17 UTCOSV refresh
  74. 2026-06-08 14:16 UTCEPSS rescore
  75. 2026-06-08 14:16 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-4693?
CVE-2023-4693 is a medium vulnerability published on October 25, 2023. An out-of-bounds read flaw was found on grub2's NTFS filesystem driver. This issue may allow a physically present attacker to present a specially crafted NTFS file system image to read arbitrary memory locations. A successful attack allows sensitive data cached in memory or EFI variable values to…
When was CVE-2023-4693 disclosed?
CVE-2023-4693 was first published in the National Vulnerability Database on October 25, 2023, with the most recent update on July 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-4693 actively exploited?
CVE-2023-4693 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 60.1% of all scored CVEs.
What is the CVSS score of CVE-2023-4693?
CVE-2023-4693 has a CVSS v3 base score of 4.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 5.3.
How do I remediate CVE-2023-4693?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-4693, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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