CVE-2023-39975

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2023-08-16. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

kdc/do_tgs_req.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an authenticated user can trigger an authorization-data handling failure. Incorrect data is copied from one ticket to another.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
40(Track)
EG Risk 40/100SSVC: 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
Severity88% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
72%
KEV
Not listed

Published

August 16, 2023

Last Modified

February 25, 2026

Advisory Details (6)

Auto-updated Aug 6, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20240201-0005/
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20230915-0014/
generic

Comparing krb5-1.21.1-final...krb5-1.21.2-final · krb5/krb5 · GitHub

https://github.com/krb5/krb5/compare/krb5-1.21.1-final...krb5-1.21.2-final
github_commit

commit 88a1701b423c (krb5/krb5)

Fix landed in krb5/krb5 commit 88a1701b423c — awaiting tagged release

https://github.com/krb5/krb5/commit/88a1701b423c13991a8064feeb26952d3641d840
generic

Kerberos Security Advisories

https://web.mit.edu/kerberos/www/advisories/
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20240201-0008/

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkrb5-0:1.21.1-1.el92023-11-07redhat

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.

Weakness Classification(1)

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

All Vendor Advisories

(1)

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 / 33× 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 161 total refreshes for this CVE.

  1. 2026-09-07 15:59 UTCEPSS rescore
  2. 2026-09-06 13:45 UTCEPSS rescore
  3. 2026-09-06 13:45 UTCEPSS rescore
  4. 2026-09-05 15:26 UTCEPSS rescore
  5. 2026-09-04 13:58 UTCEPSS rescore
  6. 2026-09-04 05:04 UTCEPSS rescore
  7. 2026-09-03 20:46 UTCOSV refresh
  8. 2026-09-02 14:09 UTCEPSS rescore
  9. 2026-09-01 13:51 UTCEPSS rescore
  10. 2026-08-30 19:15 UTCEPSS rescore
  11. 2026-08-30 01:20 UTCEPSS rescore
  12. 2026-08-28 21:39 UTCEPSS rescore
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  14. 2026-08-26 14:44 UTCEPSS rescore
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  16. 2026-08-25 13:46 UTCEPSS rescore
  17. 2026-08-23 00:17 UTCEPSS rescore
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  19. 2026-08-20 22:53 UTCEPSS rescore
  20. 2026-08-19 17:02 UTCEPSS rescore
  21. 2026-08-19 17:02 UTCEPSS rescore
  22. 2026-08-18 13:46 UTCEPSS rescore
  23. 2026-08-17 13:45 UTCEPSS rescore
  24. 2026-08-17 09:55 UTCOSV refresh
  25. 2026-08-16 14:54 UTCEPSS rescore
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  1. 2026-08-16 02:12 UTCEPSS rescore
  2. 2026-08-15 01:28 UTCEPSS rescore
  3. 2026-08-15 01:28 UTCEPSS rescore
  4. 2026-08-13 21:58 UTCEPSS rescore
  5. 2026-08-12 13:48 UTCEPSS rescore
  6. 2026-08-11 13:39 UTCEPSS rescore
  7. 2026-08-09 13:44 UTCEPSS rescore
  8. 2026-08-09 13:44 UTCEPSS rescore
  9. 2026-08-08 16:35 UTCEPSS rescore
  10. 2026-08-07 16:25 UTCEPSS rescore
  11. 2026-08-06 13:45 UTCEPSS rescore
  12. 2026-08-05 19:15 UTCEPSS rescore
  13. 2026-08-04 15:07 UTCEPSS rescore
  14. 2026-08-02 04:18 UTCOSV refresh
  15. 2026-08-02 02:25 UTCEPSS rescore
  16. 2026-08-02 02:25 UTCEPSS rescore
  17. 2026-08-01 04:14 UTCEPSS rescore
  18. 2026-08-01 04:13 UTCEPSS rescore
  19. 2026-07-30 16:26 UTCEPSS rescore
  20. 2026-07-30 16:26 UTCEPSS rescore
  21. 2026-07-30 01:28 UTCEPSS rescore
  22. 2026-07-30 01:28 UTCEPSS rescore
  23. 2026-07-28 15:34 UTCEPSS rescore
  24. 2026-07-28 15:34 UTCEPSS rescore
  25. 2026-07-26 14:52 UTCEPSS rescore
  26. 2026-07-26 14:52 UTCEPSS rescore
  27. 2026-07-25 14:16 UTCEPSS rescore
  28. 2026-07-23 14:16 UTCEPSS rescore
  29. 2026-07-23 14:16 UTCEPSS rescore
  30. 2026-07-23 02:25 UTCEG score recompute
  31. 2026-07-22 23:12 UTCEG score recompute
  32. 2026-07-22 14:06 UTCEPSS rescore
  33. 2026-07-21 15:23 UTCEPSS rescore
  34. 2026-07-21 15:23 UTCEPSS rescore
  35. 2026-07-20 17:06 UTCEPSS rescore
  36. 2026-07-19 02:27 UTCEPSS rescore
  37. 2026-07-18 10:03 UTCEPSS rescore
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  39. 2026-07-16 17:01 UTCEPSS rescore
  40. 2026-07-16 17:01 UTCEPSS rescore
  41. 2026-07-15 16:56 UTCEPSS rescore
  42. 2026-07-15 16:56 UTCEPSS rescore
  43. 2026-07-15 11:49 UTCOSV refresh
  44. 2026-07-15 01:58 UTCEPSS rescore
  45. 2026-07-13 22:28 UTCEPSS rescore
  46. 2026-07-13 22:28 UTCEPSS rescore
  47. 2026-07-12 05:45 UTCEPSS rescore
  48. 2026-07-12 05:45 UTCEPSS rescore
  49. 2026-07-11 08:26 UTCEPSS rescore
  50. 2026-07-11 08:26 UTCEPSS rescore
  51. 2026-07-09 19:08 UTCEPSS rescore
  52. 2026-07-08 15:13 UTCEPSS rescore
  53. 2026-07-07 13:44 UTCEPSS rescore
  54. 2026-07-06 16:26 UTCEPSS rescore
  55. 2026-07-06 16:26 UTCEPSS rescore
  56. 2026-07-06 02:22 UTCEPSS rescore
  57. 2026-07-05 02:29 UTCEPSS rescore
  58. 2026-07-04 06:29 UTCEPSS rescore
  59. 2026-07-01 15:05 UTCEPSS rescore
  60. 2026-06-30 23:21 UTCEPSS rescore
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  62. 2026-06-29 14:05 UTCEPSS rescore
  63. 2026-06-28 14:06 UTCEPSS rescore
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  65. 2026-06-28 04:55 UTCEPSS rescore
  66. 2026-06-28 04:55 UTCEPSS rescore
  67. 2026-06-27 12:34 UTCOSV refresh
  68. 2026-06-27 03:07 UTCEPSS rescore
  69. 2026-06-27 03:07 UTCEPSS rescore
  70. 2026-06-25 13:48 UTCEPSS rescore
  71. 2026-06-25 13:48 UTCEPSS rescore
  72. 2026-06-24 14:04 UTCEPSS rescore
  73. 2026-06-24 14:04 UTCEPSS rescore
  74. 2026-06-23 21:31 UTCEPSS rescore
  75. 2026-06-23 21:31 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-39975?
CVE-2023-39975 is a high vulnerability published on August 16, 2023. kdc/dotgsreq.c in MIT Kerberos 5 (aka krb5) 1.21 before 1.21.2 has a double free that is reachable if an authenticated user can trigger an authorization-data handling failure. Incorrect data is copied from one ticket to another.
When was CVE-2023-39975 disclosed?
CVE-2023-39975 was first published in the National Vulnerability Database on August 16, 2023, with the most recent update on February 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-39975 actively exploited?
CVE-2023-39975 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 28.0% of all scored CVEs.
What is the CVSS score of CVE-2023-39975?
CVE-2023-39975 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2023-39975?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-39975, 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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