CVE-2023-39969

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.0 under NVD CVSS v3. EPSS exploit probability: 0.5%, top 62% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.0Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures. Version 1.0.9 of uthenticode hashed the entire file rather than hashing sections by virtual address, in violation of the Authenticode specification. As a result, an attacker could modify code within a binary without changing its Authenticode hash, making it appear valid from uthenticode's perspective. Versions of uthenticode prior to 1.0.9 are not vulnerable to this attack, nor are versions in the 2.x series. By design, uthenticode does not perform full-chain validation. However, the malleability of signature verification introduced in 1.0.9 was an unintended oversight. The 2.x series addresses the vulnerability. Versions prior to 1.0.9 are also not vulnerable, but users are encouraged to upgrade rather than downgrade. There are no workarounds to this vulnerability.

CVSS v3
9.0
EG Score
9.0(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: 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
Severity90% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
37.7%
KEV
Not listed

Published

August 9, 2023

Last Modified

November 21, 2024

References (6)

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 51× 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 110 total refreshes for this CVE.

  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 14:16 UTCEPSS rescore
  3. 2026-07-23 02:25 UTCEG score recompute
  4. 2026-07-22 23:12 UTCEG score recompute
  5. 2026-07-22 14:06 UTCEPSS rescore
  6. 2026-07-21 15:23 UTCEPSS rescore
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  8. 2026-07-20 17:06 UTCEPSS rescore
  9. 2026-07-19 14:29 UTCEPSS rescore
  10. 2026-07-19 02:27 UTCEPSS rescore
  11. 2026-07-18 10:03 UTCEPSS rescore
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  13. 2026-07-16 17:01 UTCEPSS rescore
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  15. 2026-07-15 16:56 UTCEPSS rescore
  16. 2026-07-15 16:56 UTCEPSS rescore
  17. 2026-07-15 12:49 UTCOSV refresh
  18. 2026-07-15 01:58 UTCEPSS rescore
  19. 2026-07-13 22:28 UTCEPSS rescore
  20. 2026-07-13 22:28 UTCEPSS rescore
  21. 2026-07-13 06:11 UTCEPSS rescore
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  23. 2026-07-12 05:45 UTCEPSS rescore
  24. 2026-07-12 05:45 UTCEPSS rescore
  25. 2026-07-11 08:26 UTCEPSS rescore
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  1. 2026-07-11 08:26 UTCEPSS rescore
  2. 2026-07-09 19:08 UTCEPSS rescore
  3. 2026-07-08 15:13 UTCEPSS rescore
  4. 2026-07-07 13:44 UTCEPSS rescore
  5. 2026-07-06 16:26 UTCEPSS rescore
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  7. 2026-07-06 02:22 UTCEPSS rescore
  8. 2026-07-05 02:29 UTCEPSS rescore
  9. 2026-07-04 06:29 UTCEPSS rescore
  10. 2026-07-01 15:05 UTCEPSS rescore
  11. 2026-06-30 23:21 UTCEPSS rescore
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  16. 2026-06-28 04:55 UTCEPSS rescore
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  18. 2026-06-27 13:04 UTCOSV refresh
  19. 2026-06-27 03:07 UTCEPSS rescore
  20. 2026-06-27 03:07 UTCEPSS rescore
  21. 2026-06-25 13:48 UTCEPSS rescore
  22. 2026-06-25 13:48 UTCEPSS rescore
  23. 2026-06-24 14:04 UTCEPSS rescore
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  25. 2026-06-23 21:31 UTCEPSS rescore
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  27. 2026-06-22 14:24 UTCEPSS rescore
  28. 2026-06-22 14:24 UTCEPSS rescore
  29. 2026-06-21 14:55 UTCEPSS rescore
  30. 2026-06-21 14:55 UTCEPSS rescore
  31. 2026-06-21 01:58 UTCEPSS rescore
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  33. 2026-06-19 19:24 UTCEPSS rescore
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  35. 2026-06-18 17:51 UTCEPSS rescore
  36. 2026-06-17 17:51 UTCEPSS rescore
  37. 2026-06-17 17:51 UTCEPSS rescore
  38. 2026-06-16 17:51 UTCEPSS rescore
  39. 2026-06-16 17:51 UTCEPSS rescore
  40. 2026-06-15 17:47 UTCEPSS rescore
  41. 2026-06-15 17:47 UTCEPSS rescore
  42. 2026-06-14 23:16 UTCEPSS rescore
  43. 2026-06-13 22:59 UTCEPSS rescore
  44. 2026-06-13 22:59 UTCEPSS rescore
  45. 2026-06-12 23:10 UTCEPSS rescore
  46. 2026-06-12 23:10 UTCEPSS rescore
  47. 2026-06-11 13:59 UTCEPSS rescore
  48. 2026-06-11 13:59 UTCEPSS rescore
  49. 2026-06-10 22:17 UTCEPSS rescore
  50. 2026-06-10 13:21 UTCEPSS rescore
  51. 2026-06-10 13:21 UTCEPSS rescore
  52. 2026-06-09 23:47 UTCOSV refresh
  53. 2026-06-08 14:16 UTCEPSS rescore
  54. 2026-06-08 14:16 UTCEPSS rescore
  55. 2026-06-07 15:23 UTCEPSS rescore
  56. 2026-06-07 15:23 UTCEPSS rescore
  57. 2026-06-06 13:46 UTCEPSS rescore
  58. 2026-06-06 13:46 UTCEPSS rescore
  59. 2026-06-05 22:46 UTCEPSS rescore
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  61. 2026-06-05 06:09 UTCEPSS rescore
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  64. 2026-06-04 13:11 UTCEPSS rescore
  65. 2026-06-04 13:11 UTCEPSS rescore
  66. 2026-06-02 20:12 UTCEPSS rescore
  67. 2026-06-02 20:12 UTCEPSS rescore
  68. 2026-06-01 13:51 UTCEPSS rescore
  69. 2026-06-01 13:51 UTCEPSS rescore
  70. 2026-05-31 22:30 UTCEPSS rescore
  71. 2026-05-31 22:29 UTCEPSS rescore
  72. 2026-05-31 00:15 UTCEPSS rescore
  73. 2026-05-31 00:15 UTCEPSS rescore
  74. 2026-05-29 13:43 UTCEPSS rescore
  75. 2026-05-29 13:43 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-39969?
CVE-2023-39969 is a critical vulnerability published on August 9, 2023. uthenticode is a small cross-platform library for partially verifying Authenticode digital signatures. Version 1.0.9 of uthenticode hashed the entire file rather than hashing sections by virtual address, in violation of the Authenticode specification. As a result, an attacker could modify code…
When was CVE-2023-39969 disclosed?
CVE-2023-39969 was first published in the National Vulnerability Database on August 9, 2023, 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-2023-39969 actively exploited?
CVE-2023-39969 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-39969?
CVE-2023-39969 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2023-39969?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39969, 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.

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