CVE-2023-40551

MEDIUMNVD 5.15.1—
EchelonGraph scoreMEDIUM confidence

Score 5.1 from GitHub Security Advisory published 2024-01-29. NVD baseline CVSS 5.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.1Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or possible exposure of sensitive data during the system's boot phase.

CVSS v3
5.1
EG Score
5.1(medium)
EG Risk
23(Track)
EG Risk 23/100SSVC: 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
Severity51% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

January 29, 2024

Last Modified

November 21, 2024

References (23)

Vendor Advisories for CVE-2023-40551(9)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatshim-0:15.8-2.el8_62024-04-29redhat
redhatshim-signed-0:15.8-1.el72024-04-23redhat
redhatshim-0:15.8-4.el9_32024-04-18redhat
redhatshim-0:15.8-2.el8_42024-04-18redhat
redhatshim-0:15.8-4.el8_92024-04-18redhat
redhatshim-unsigned-x64-0:15.8-2.el82024-04-18redhat
redhatshim-0:15.8-3.el9_22024-04-18redhat
redhatshim-0:15.8-2.el8_22024-04-16redhat
redhatshim-unsigned-x64-0:15.8-2.el92024-04-16redhat

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
shim15+1533136590.3beb971-10 ... 15.7-1~deb11u1 (30 versions)15.8-1~deb10u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
shim15.4-7 ... 15.8-1~deb10u1 (8 versions)15.8-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
shim15.7-1, 15.8-1~deb10u1, 15.8-1~deb11u115.8-1~deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
shim—15.8-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
shim—15.8-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(1)

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.

Data Freshness Timeline

(refreshed 6× in last 7d / 29× 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 177 total refreshes for this CVE.

  1. 2026-09-18 19:25 UTCEPSS rescore
  2. 2026-09-17 19:25 UTCEPSS rescore
  3. 2026-09-16 14:06 UTCEPSS rescore
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  17. 2026-09-03 07:00 UTCOSV refresh
  18. 2026-09-02 14:09 UTCEPSS rescore
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  20. 2026-08-30 19:15 UTCEPSS rescore
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  1. 2026-08-25 13:46 UTCEPSS rescore
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  7. 2026-08-18 13:46 UTCEPSS rescore
  8. 2026-08-17 13:45 UTCEPSS rescore
  9. 2026-08-16 20:26 UTCOSV refresh
  10. 2026-08-16 14:54 UTCEPSS rescore
  11. 2026-08-16 02:12 UTCEPSS rescore
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  22. 2026-08-05 19:15 UTCEPSS rescore
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  24. 2026-08-03 10:34 UTCEPSS rescore
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  26. 2026-08-02 02:25 UTCEPSS rescore
  27. 2026-08-02 02:25 UTCEPSS rescore
  28. 2026-08-01 14:36 UTCOSV refresh
  29. 2026-08-01 04:14 UTCEPSS rescore
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  41. 2026-07-23 14:16 UTCEPSS rescore
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  43. 2026-07-23 02:25 UTCEG score recompute
  44. 2026-07-22 23:12 UTCEG score recompute
  45. 2026-07-22 14:06 UTCEPSS rescore
  46. 2026-07-21 15:23 UTCEPSS rescore
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  48. 2026-07-20 17:06 UTCEPSS rescore
  49. 2026-07-19 14:29 UTCEPSS rescore
  50. 2026-07-19 02:27 UTCEPSS rescore
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  58. 2026-07-14 21:25 UTCOSV refresh
  59. 2026-07-13 22:28 UTCEPSS rescore
  60. 2026-07-13 22:28 UTCEPSS rescore
  61. 2026-07-13 06:11 UTCEPSS rescore
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  65. 2026-07-11 08:26 UTCEPSS rescore
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  67. 2026-07-09 19:08 UTCEPSS rescore
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Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-40551?
CVE-2023-40551 is a medium vulnerability published on January 29, 2024. A flaw was found in the MZ binary format in Shim. An out-of-bounds read may occur, leading to a crash or possible exposure of sensitive data during the system's boot phase.
When was CVE-2023-40551 disclosed?
CVE-2023-40551 was first published in the National Vulnerability Database on January 29, 2024, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-40551 actively exploited?
CVE-2023-40551 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 66.3% of all scored CVEs.
What is the CVSS score of CVE-2023-40551?
CVE-2023-40551 has a CVSS v3 base score of 5.1 (NVD).
How do I remediate CVE-2023-40551?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-40551, 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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