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VulnerabilityPublished Updated

CVE-2025-1014: Certificate length was not properly checked when added to a certificate store

Source GCVE Database

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Authoritative record:CVE-2025-1014· High 8.8

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

CVSS 3.1 base score
8.8High
How severe the flaw is on the 0–10 CVSS scale.
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:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Feb 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

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