CVE-2025-9820

MEDIUMPre-NVD 4.04.0—
EchelonGraph scoreMEDIUM confidence

Score 4.0 from GitHub Security Advisory published 2026-01-26. a secondary CVSS source baseline 4.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
4.0EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 4.0Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in the GnuTLS library, specifically in the gnutls_pkcs11_token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the application using GnuTLS to crash or, in certain conditions, be exploited for code execution. As a result, systems or applications relying on GnuTLS may be vulnerable to a denial of service or local privilege escalation attacks.

CVSS v3
4.0
EG Score
4.0MEDIUMmedium confidence
EG Risk
18
EG Risk 18/100

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
Severity40% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.2%
EPSS %ILE
12th
KEV
Not listed

Published

January 26, 2026

Last Modified

September 1, 2026

Advisory Details (10)

Auto-updated Jun 25, 2026
Patch available. Sources: redhat.
redhatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2025-9820
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:7477
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:7329
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:5606
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2026:5585
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:4943
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:4655
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 9.

https://access.redhat.com/errata/RHSA-2026:4188
redhatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 10.

https://access.redhat.com/errata/RHSA-2026:3477
redhatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:13812

Vendor Advisories for CVE-2025-9820(9)

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

Patch Availability(11)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibgnutls30t64 (3.8.9-3ubuntu2.1) @ questing2026-08-21ubuntu
ubuntulibgnutlsxx28 (3.6.13-2ubuntu1.12+esm2) @ focal2026-08-21ubuntu
redhatrhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.17773257082026-05-05redhat
redhatgnutls-main-3.8.12-1.1.hum12026-04-10redhat
redhatdiscovery/discovery-ui-rhel9:17756759222026-04-09redhat
redhatrhceph/rhceph-8-rhel9:17740028672026-03-24redhat
redhatgnutls-0:3.6.16-8.el8_10.52026-03-24redhat
redhatrhui5/rhua-rhel9:17736701372026-03-18redhat
redhatinsights-proxy/insights-proxy-container-rhel9:17736855092026-03-16redhat
redhatgnutls-0:3.8.3-10.el9_72026-03-10redhat
redhatgnutls-0:3.8.10-3.el10_12026-03-02redhat

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

(9 across 9 ecosystems)
Alpine:v3.20(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.12-r0: fixed in 3.8.12-r0
—
Alpine:v3.21(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.12-r0: fixed in 3.8.12-r0
—
Alpine:v3.22(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.12-r0: fixed in 3.8.12-r0
—
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.11-r0: fixed in 3.8.11-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls—
  • every version up to 3.8.11-r0: fixed in 3.8.11-r0
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.1-5 ... 3.7.1-5+deb11u8 (9 versions)
  • every version up to 3.7.1-5+deb11u9: fixed in 3.7.1-5+deb11u9
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.7.9-2 ... 3.7.9-2+deb12u5 (6 versions)
  • every version up to 3.7.9-2+deb12u6: fixed in 3.7.9-2+deb12u6
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.9-3
  • every version up to 3.8.9-3+deb13u1: fixed in 3.8.9-3+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
gnutls283.8.10-1 ... 3.8.9-3 (6 versions)
  • every version up to 3.8.11-3: fixed in 3.8.11-3
—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

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 8× in last 7d / 22× 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 207 total refreshes for this CVE.

  1. 2026-10-10 02:33 UTCOSV refresh
  2. 2026-10-09 20:06 UTCEPSS rescore
  3. 2026-10-08 17:11 UTCEPSS rescore
  4. 2026-10-07 23:47 UTCEPSS rescore
  5. 2026-10-06 15:17 UTCEPSS rescore
  6. 2026-10-05 17:42 UTCEPSS rescore
  7. 2026-10-04 23:21 UTCEPSS rescore
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-01 19:49 UTCEPSS rescore
  10. 2026-09-30 15:02 UTCEPSS rescore
  11. 2026-09-29 15:20 UTCEPSS rescore
  12. 2026-09-28 13:50 UTCEPSS rescore
  13. 2026-09-26 15:58 UTCEPSS rescore
  14. 2026-09-23 13:47 UTCEPSS rescore
  15. 2026-09-20 20:15 UTCEPSS rescore
  16. 2026-09-20 11:51 UTCOSV refresh
  17. 2026-09-18 19:27 UTCEPSS rescore
  18. 2026-09-16 05:14 UTCEPSS rescore
  19. 2026-09-13 16:46 UTCEPSS rescore
  20. 2026-09-12 15:00 UTCEPSS rescore
  21. 2026-09-11 14:52 UTCEPSS rescore
  22. 2026-09-11 09:36 UTCEPSS rescore
  23. 2026-09-10 09:34 UTCEPSS rescore
  24. 2026-09-08 22:00 UTCEPSS rescore
  25. 2026-09-07 16:01 UTCEPSS rescore
Show 75 more
  1. 2026-09-06 13:47 UTCEPSS rescore
  2. 2026-09-04 05:06 UTCEPSS rescore
  3. 2026-09-02 14:11 UTCEPSS rescore
  4. 2026-09-01 13:53 UTCEG score recompute
  5. 2026-09-01 13:53 UTCVendor advisory
  6. 2026-09-01 13:53 UTCGHSA enrichment
  7. 2026-09-01 13:53 UTCEPSS rescore
  8. 2026-09-01 12:25 UTCEG score recompute
  9. 2026-09-01 12:25 UTCVendor advisory
  10. 2026-09-01 12:25 UTCGHSA enrichment
  11. 2026-09-01 04:39 UTCEPSS rescore
  12. 2026-08-31 16:43 UTCEG score recompute
  13. 2026-08-31 16:43 UTCVendor advisory
  14. 2026-08-31 16:43 UTCGHSA enrichment
  15. 2026-08-30 19:17 UTCEPSS rescore
  16. 2026-08-30 01:21 UTCEPSS rescore
  17. 2026-08-28 21:40 UTCEPSS rescore
  18. 2026-08-27 14:24 UTCEPSS rescore
  19. 2026-08-25 13:48 UTCEPSS rescore
  20. 2026-08-23 00:19 UTCEPSS rescore
  21. 2026-08-21 23:48 UTCEPSS rescore
  22. 2026-08-21 18:18 UTCEG score recompute
  23. 2026-08-21 18:18 UTCVendor advisory
  24. 2026-08-21 18:18 UTCGHSA enrichment
  25. 2026-08-21 17:24 UTCEG score recompute
  26. 2026-08-21 17:24 UTCVendor advisory
  27. 2026-08-21 17:24 UTCGHSA enrichment
  28. 2026-08-21 13:23 UTCEG score recompute
  29. 2026-08-21 13:23 UTCVendor advisory
  30. 2026-08-21 13:23 UTCGHSA enrichment
  31. 2026-08-21 13:09 UTCEG score recompute
  32. 2026-08-21 13:09 UTCVendor advisory
  33. 2026-08-21 13:09 UTCGHSA enrichment
  34. 2026-08-20 22:55 UTCEPSS rescore
  35. 2026-08-19 17:03 UTCEPSS rescore
  36. 2026-08-18 13:48 UTCEPSS rescore
  37. 2026-08-16 14:56 UTCEPSS rescore
  38. 2026-08-16 02:14 UTCEPSS rescore
  39. 2026-08-15 01:30 UTCEPSS rescore
  40. 2026-08-14 12:17 UTCEG score recompute
  41. 2026-08-14 12:16 UTCVendor advisory
  42. 2026-08-14 12:16 UTCGHSA enrichment
  43. 2026-08-13 22:00 UTCEPSS rescore
  44. 2026-08-13 04:28 UTCEG score recompute
  45. 2026-08-13 04:28 UTCVendor advisory
  46. 2026-08-13 04:28 UTCGHSA enrichment
  47. 2026-08-12 13:50 UTCEPSS rescore
  48. 2026-08-11 13:42 UTCEPSS rescore
  49. 2026-08-10 23:59 UTCEPSS rescore
  50. 2026-08-09 18:16 UTCEG score recompute
  51. 2026-08-09 18:16 UTCVendor advisory
  52. 2026-08-09 18:16 UTCGHSA enrichment
  53. 2026-08-09 13:46 UTCEPSS rescore
  54. 2026-08-08 16:37 UTCEPSS rescore
  55. 2026-08-07 23:30 UTCEG score recompute
  56. 2026-08-07 23:30 UTCVendor advisory
  57. 2026-08-07 23:30 UTCGHSA enrichment
  58. 2026-08-06 13:46 UTCEPSS rescore
  59. 2026-08-06 04:56 UTCEG score recompute
  60. 2026-08-06 04:56 UTCVendor advisory
  61. 2026-08-06 04:56 UTCGHSA enrichment
  62. 2026-08-05 19:17 UTCEPSS rescore
  63. 2026-08-04 15:09 UTCEPSS rescore
  64. 2026-08-04 10:38 UTCEPSS rescore
  65. 2026-08-03 10:35 UTCEPSS rescore
  66. 2026-08-02 22:06 UTCEG score recompute
  67. 2026-08-02 22:06 UTCVendor advisory
  68. 2026-08-02 22:06 UTCGHSA enrichment
  69. 2026-08-02 02:26 UTCEPSS rescore
  70. 2026-08-01 04:15 UTCEPSS rescore
  71. 2026-07-31 06:42 UTCOSV refresh
  72. 2026-07-30 16:27 UTCEPSS rescore
  73. 2026-07-30 01:30 UTCEPSS rescore
  74. 2026-07-28 15:36 UTCEPSS rescore
  75. 2026-07-27 14:13 UTCEPSS rescore

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2025-9820?
CVE-2025-9820 is a medium vulnerability published on January 26, 2026. A flaw was found in the GnuTLS library, specifically in the gnutlspkcs11token_init() function that handles PKCS#11 token initialization. When a token label longer than expected is processed, the function writes past the end of a fixed-size stack buffer. This programming error can cause the…
When was CVE-2025-9820 disclosed?
CVE-2025-9820 was first published on January 26, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-9820 actively exploited?
CVE-2025-9820 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (12th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2025-9820?
CVE-2025-9820 has a CVSS base score of 4.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2025-9820?
A fix for CVE-2025-9820 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2025-9820 are linked in the Vendor Advisories panel on this page.

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