🛡️ CVE-2025-1931 on Debian — firefox-esr
Description
It was possible to cause a use-after-free in the content process side of a WebTransport connection, leading to a potentially exploitable crash. This vulnerability was fixed in Firefox 136, Firefox ESR 115.21, Firefox ESR 128.8, Thunderbird 136, and Thunderbird 128.8.
Distribution advisory
This page covers CVE-2025-1931 as tracked by Debian, for the package firefox-esr. The fix is available in version 128.8.0esr-1; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.
Weakness class
DEBIAN-CVE-2025-1931 is classified as CWE-416: Use After Free. Memory is used after being released, so its contents may already belong to something else.
Affected software
DEBIAN-CVE-2025-1931 is recorded against 2 packages.
- firefox-esr (fixed in 128.8.0esr-1)
- thunderbird (fixed in 1:128.8.0esr-1)
Timeline and source
Published on 4 March 2025 and last revised on 4 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
CVE-2025-1931 on other distributions
Each distribution ships its own build and its own fixed version. Pick the one you run:
Details
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Packages
| Software | From version | Fixed in |
|---|---|---|
| firefox-esr | — | 128.8.0esr-1 |
| thunderbird | — | 1:128.8.0esr-1 |
References
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Site Security Check
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DEBIAN-CVE-2025-1931 is rated CVSS 7.5 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.
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