CVE-2023-5981

MEDIUMNVD 5.97.4▲
EchelonGraph scoreMEDIUM confidence

Score 7.4 from GitHub Security Advisory (severity: HIGH) published 2023-11-28. NVD baseline CVSS 5.9; sources differ by 1.5.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
5.9
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 5.9Exploit: NoneExposed: 0

A fix is available — apply it.

A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.

CVSS v3
5.9
EG Score
7.4(medium)
EPSS
66.1%
KEV
Not listed

Published

November 28, 2023

Last Modified

June 17, 2026

References (24)

Vendor Advisories for CVE-2023-5981(1)

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
ubuntulibgnutlsxx28 (3.5.18-1ubuntu1.6+esm1) @ bionic2026-05-24ubuntu
ubuntulibgnutls30 (3.8.1-4ubuntu1.1) @ mantic2026-05-24ubuntu
redhatopenshift-logging/vector-rhel9:v0.28.1-562024-05-01redhat
redhatodf4/rook-ceph-rhel9-operator:v4.15.0-1032024-03-19redhat
redhatgnutls-0:3.7.6-23.el9_3.32024-01-29redhat
redhatgnutls-0:3.7.6-21.el9_2.12024-01-25redhat
redhatgnutls-0:3.6.16-7.el8_8.12024-01-24redhat
redhatgnutls-0:3.6.16-5.el8_6.22024-01-22redhat
redhatgnutls-0:3.6.16-8.el8_92024-01-10redhat

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(2)

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

Additional Vendor Advisories

(9)

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 10× in last 7d / 43× 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.

  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 13:45 UTCEPSS rescore
  5. 2026-07-07 13:44 UTCEPSS rescore
  6. 2026-07-06 16:26 UTCEPSS rescore
  7. 2026-07-06 16:26 UTCEPSS rescore
  8. 2026-07-06 02:22 UTCEPSS rescore
  9. 2026-07-06 02:22 UTCEPSS rescore
  10. 2026-07-05 02:29 UTCEPSS rescore
  11. 2026-07-04 06:29 UTCEPSS rescore
  12. 2026-07-01 15:05 UTCEPSS rescore
  13. 2026-06-30 23:21 UTCEPSS rescore
  14. 2026-06-30 23:21 UTCEPSS rescore
  15. 2026-06-29 14:05 UTCEPSS rescore
  16. 2026-06-28 14:06 UTCEPSS rescore
  17. 2026-06-28 14:06 UTCEPSS rescore
  18. 2026-06-28 04:55 UTCEPSS rescore
  19. 2026-06-27 03:37 UTCOSV refresh
  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
  24. 2026-06-24 14:04 UTCEPSS rescore
  25. 2026-06-23 21:31 UTCEPSS rescore
Show 53 more
  1. 2026-06-23 21:31 UTCEPSS rescore
  2. 2026-06-22 14:24 UTCEPSS rescore
  3. 2026-06-22 14:24 UTCEPSS rescore
  4. 2026-06-21 14:55 UTCEPSS rescore
  5. 2026-06-21 14:55 UTCEPSS rescore
  6. 2026-06-21 01:58 UTCEPSS rescore
  7. 2026-06-21 01:58 UTCEPSS rescore
  8. 2026-06-19 19:24 UTCEPSS rescore
  9. 2026-06-19 19:24 UTCEPSS rescore
  10. 2026-06-18 17:51 UTCEPSS rescore
  11. 2026-06-17 17:51 UTCEPSS rescore
  12. 2026-06-16 17:51 UTCEPSS rescore
  13. 2026-06-16 17:51 UTCEPSS rescore
  14. 2026-06-15 17:47 UTCEPSS rescore
  15. 2026-06-14 23:16 UTCEPSS rescore
  16. 2026-06-13 22:59 UTCEPSS rescore
  17. 2026-06-13 22:59 UTCEPSS rescore
  18. 2026-06-12 23:11 UTCEPSS rescore
  19. 2026-06-11 13:59 UTCEPSS rescore
  20. 2026-06-10 22:17 UTCEPSS rescore
  21. 2026-06-10 13:21 UTCEPSS rescore
  22. 2026-06-09 14:17 UTCOSV refresh
  23. 2026-06-08 14:16 UTCEPSS rescore
  24. 2026-06-08 14:16 UTCEPSS rescore
  25. 2026-06-07 15:24 UTCEPSS rescore
  26. 2026-06-07 15:24 UTCEPSS rescore
  27. 2026-06-06 13:46 UTCEPSS rescore
  28. 2026-06-06 13:46 UTCEPSS rescore
  29. 2026-06-05 22:46 UTCEPSS rescore
  30. 2026-06-05 22:46 UTCEPSS rescore
  31. 2026-06-05 06:09 UTCEPSS rescore
  32. 2026-06-05 06:09 UTCEPSS rescore
  33. 2026-06-04 13:11 UTCEPSS rescore
  34. 2026-06-04 13:11 UTCEPSS rescore
  35. 2026-06-02 20:12 UTCEPSS rescore
  36. 2026-06-02 20:12 UTCEPSS rescore
  37. 2026-06-01 13:51 UTCEPSS rescore
  38. 2026-05-31 22:30 UTCEPSS rescore
  39. 2026-05-31 22:30 UTCEPSS rescore
  40. 2026-05-31 00:15 UTCEPSS rescore
  41. 2026-05-31 00:15 UTCEPSS rescore
  42. 2026-05-29 13:43 UTCEPSS rescore
  43. 2026-05-28 13:44 UTCEPSS rescore
  44. 2026-05-28 13:44 UTCEPSS rescore
  45. 2026-05-27 13:40 UTCEPSS rescore
  46. 2026-05-27 13:39 UTCEPSS rescore
  47. 2026-05-26 13:43 UTCEPSS rescore
  48. 2026-05-26 13:43 UTCEPSS rescore
  49. 2026-05-26 07:18 UTCEPSS rescore
  50. 2026-05-26 07:18 UTCEPSS rescore
  51. 2026-05-24 13:14 UTCEG score recompute
  52. 2026-05-24 13:14 UTCVendor advisory
  53. 2026-05-24 13:14 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2023-5981?
CVE-2023-5981 is a medium vulnerability published on November 28, 2023. A vulnerability was found that the response times to malformed ciphertexts in RSA-PSK ClientKeyExchange differ from response times of ciphertexts with correct PKCS#1 v1.5 padding.
When was CVE-2023-5981 disclosed?
CVE-2023-5981 was first published in the National Vulnerability Database on November 28, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-5981 actively exploited?
CVE-2023-5981 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 66.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-5981?
CVE-2023-5981 has a CVSS v3 base score of 5.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.4.
How do I remediate CVE-2023-5981?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-5981, 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

Explore the affected products and dependency analysis for CVE-2023-5981

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