What’s Vulnerable › Vulnerabilities

CVE-2025-1014: Certificate length was not properly checked

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-04 · updated 2026-10-05
• Weakness: CWE-295

Description

Certificate length was not properly checked when added to a certificate store. In practice only trusted data was processed. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.

Affected products

• Mozilla Firefox: before 128.7.0; before 135.0 — fixed in 128.7.0, 135.0
• Mozilla Thunderbird: from 128.0.1 before 128.7.0; from 131.0 before 135.0 — fixed in 128.7.0, 135.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 128.7.0, 135.0; Mozilla Thunderbird 128.7.0, 135.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1940804
• https://www.mozilla.org/security/advisories/mfsa2025-07/
• https://www.mozilla.org/security/advisories/mfsa2025-09/
• https://www.mozilla.org/security/advisories/mfsa2025-10/
• https://www.mozilla.org/security/advisories/mfsa2025-11/
• https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html

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