CVE-2025-1014: Certificate length was not properly checked when added to a certificate store
Source GCVE Database
Not known to be exploited · CVSS 8.8 High · fixed in 135 : patch affected systems soon.
Data as of 30 Oct 2026, 01:10 UTC
- Patch
- Available – fixed in 135, 128.7
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 4 Feb 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
AI-suggested
Mozilla has released official fixes for this vulnerability in Firefox 135, Firefox ESR 128.7, Thunderbird 135, and Thunderbird 128.7. Users and administrators should update to these versions or later to remediate the issue. No additional mitigation actions are required beyond applying the official patches.
Description
CVE-2025-1014 is a vulnerability in Firefox and Thunderbird where certificate length was not properly checked when added to a certificate store. The issue is rated with low impact because in practice only trusted data was processed. This vulnerability affects Firefox versions prior to 135, Firefox ESR versions prior to 128.7, Thunderbird versions prior to 128.7, and Thunderbird versions prior to 135. Mozilla has fixed this issue in Firefox 135 and Thunderbird 135, as well as Firefox ESR 128.7 and Thunderbird 128.7.
References
- nvd.nist.gov/vuln/detail/CVE-2025-1014 (opens in a new tab)
- bugzilla.mozilla.org/show_bug.cgi?id=1940804 (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/02/msg00006.html (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-07 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-09 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-10 (opens in a new tab)
- mozilla.org/security/advisories/mfsa2025-11 (opens in a new tab)