CVE-2025-13020 Use-after-free in the WebRTC: Audio/Video component
A use-after-free flaw in the WebRTC Audio/Video component allows attackers to execute arbitrary code, requiring users to update Firefox and Thunderbird.
- 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-2025-13020?
CVE-2025-13020 is a high-severity use after free vulnerability in Mozilla Firefox, published on 11 Nov 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
Use-after-free in the WebRTC: Audio/Video component. This vulnerability was fixed in Firefox 145, Firefox ESR 140.5, Thunderbird 145, and Thunderbird 140.5.
Weakness: CWE-416
Which versions are affected by CVE-2025-13020?
It affects 1 product.
Products include Mozilla Firefox.
How do I fix CVE-2025-13020?
Upgrade to a fixed version.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-13020 being exploited?
There is no known exploitation of CVE-2025-13020 in the wild and no public exploit code.
Other vulnerabilities in Mozilla Firefox
Sources
Also known as DEBIAN-CVE-2025-13020, GHSA-2q3p-f6j6-9qhj, UBUNTU-CVE-2025-13020.