CVE-2025-1014 Certificate length was not properly checked
Improper certificate length checking in Firefox and Thunderbird could allow bypassing certificate validation, requiring an upgrade to patched versions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-1014?
CVE-2025-1014 is a high-severity vulnerability in Mozilla Firefox, published on 4 Feb 2025. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-295
Which versions are affected by CVE-2025-1014?
It affects 2 products.
Products include Mozilla Firefox, Mozilla Thunderbird.
How do I fix CVE-2025-1014?
Upgrade to a fixed version.
Is CVE-2025-1014 being exploited?
There is no known exploitation of CVE-2025-1014 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2025-1014, GHSA-v2xc-3r7v-9vrm, UBUNTU-CVE-2025-1014.