CVE-2023-6135

MEDIUMNVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

Score 4.3 from GitHub Security Advisory published 2023-12-19. NVD baseline CVSS 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 4.3Exploit: None knownExposed: 0

A fix is available — apply it.

Multiple NSS NIST curves were susceptible to a side-channel attack known as "Minerva". This attack could potentially allow an attacker to recover the private key. This vulnerability affects Firefox < 121.

CVSS v3
4.3
EG Score
4.3(medium)
EG Risk
20(Track)
EG Risk 20/100SSVC: 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
Severity43% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
52%
KEV
Not listed

Published

December 19, 2023

Last Modified

June 17, 2026

References (6)

Vendor Advisories for CVE-2023-6135(1)

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 / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-mozsymbols (121.0+build1-0ubuntu0.20.04.1) @ focal2026-05-24ubuntu
ubuntulibnss3-tools (2:3.98-0ubuntu0.23.10.1) @ mantic2026-05-24ubuntu
redhatfirefox-0:128.2.0-1.el8_22024-09-19redhat
redhatfirefox-0:128.2.0-1.el8_82024-09-19redhat
redhatfirefox-0:128.2.0-1.el9_22024-09-18redhat
redhatfirefox-0:128.2.0-1.el9_02024-09-18redhat
redhatrh-sso-7/sso7-rhel8-operator-bundle:7.6.7-42024-04-04redhat
redhatnss-0:3.90.0-6.el8_92024-02-12redhat
redhatnss-0:3.90.0-6.el9_22024-02-12redhat
redhatnss-0:3.90.0-6.el8_82024-02-12redhat
redhatnss-0:3.90.0-6.el9_32024-02-12redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
nss2:3.100-1 ... 2:3.99-1 (65 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
nss2:3.100-1 ... 2:3.99-1 (43 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
nss—2:3.95-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
nss—2:3.95-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(10)

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 7× 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 160 total refreshes for this CVE.

  1. 2026-09-18 19:26 UTCEPSS rescore
  2. 2026-09-16 14:06 UTCEPSS rescore
  3. 2026-09-16 05:11 UTCEPSS rescore
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  16. 2026-09-03 09:59 UTCOSV refresh
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  1. 2026-08-23 00:17 UTCEPSS rescore
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  5. 2026-08-19 17:02 UTCEPSS rescore
  6. 2026-08-18 13:46 UTCEPSS rescore
  7. 2026-08-16 23:26 UTCOSV refresh
  8. 2026-08-16 14:54 UTCEPSS rescore
  9. 2026-08-16 02:12 UTCEPSS rescore
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  11. 2026-08-13 21:58 UTCEPSS rescore
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  23. 2026-08-02 02:25 UTCEPSS rescore
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  25. 2026-08-01 17:36 UTCOSV refresh
  26. 2026-08-01 04:14 UTCEPSS rescore
  27. 2026-07-30 16:26 UTCEPSS rescore
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  31. 2026-07-26 14:53 UTCEPSS rescore
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  35. 2026-07-23 02:30 UTCEG score recompute
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  37. 2026-07-22 14:07 UTCEPSS rescore
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  39. 2026-07-21 15:23 UTCEPSS rescore
  40. 2026-07-20 17:06 UTCEPSS rescore
  41. 2026-07-19 14:30 UTCEPSS rescore
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  48. 2026-07-15 16:56 UTCEPSS rescore
  49. 2026-07-15 01:59 UTCEPSS rescore
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  51. 2026-07-15 00:40 UTCOSV refresh
  52. 2026-07-13 22:28 UTCEPSS rescore
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  58. 2026-07-09 19:08 UTCEPSS rescore
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  74. 2026-06-28 04:55 UTCEPSS rescore
  75. 2026-06-27 03:07 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2023-6135?
CVE-2023-6135 is a medium vulnerability published on December 19, 2023. Multiple NSS NIST curves were susceptible to a side-channel attack known as "Minerva". This attack could potentially allow an attacker to recover the private key. This vulnerability affects Firefox < 121.
When was CVE-2023-6135 disclosed?
CVE-2023-6135 was first published in the National Vulnerability Database on December 19, 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-2023-6135 actively exploited?
CVE-2023-6135 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 47.8% of all scored CVEs.
What is the CVSS score of CVE-2023-6135?
CVE-2023-6135 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2023-6135?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-6135, 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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