| Name | CVE-2025-0243 |
| Description | Memory safety bugs present in Firefox 133, Thunderbird 133, Firefox ESR 128.5, and Thunderbird 128.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 134 and Firefox ESR < 128.6. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DSA-5839-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 134.0-1 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | vulnerable |
| bullseye (security) | 128.5.0esr-1~deb11u1 | vulnerable | |
| bookworm | 128.3.1esr-1~deb12u1 | vulnerable | |
| bookworm (security) | 128.6.0esr-1~deb12u1 | fixed | |
| trixie | 128.5.0esr-1 | vulnerable | |
| sid | 128.6.0esr-1 | fixed | |
| thunderbird (PTS) | bullseye | 1:115.12.0-1~deb11u1 | vulnerable |
| bullseye (security) | 1:128.5.0esr-1~deb11u1 | vulnerable | |
| bookworm | 1:115.16.0esr-1~deb12u1 | vulnerable | |
| bookworm (security) | 1:128.5.0esr-1~deb12u1 | vulnerable | |
| trixie | 1:128.5.2esr-1 | vulnerable | |
| sid | 1:128.6.0esr-1 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| firefox | source | (unstable) | 134.0-1 | |||
| firefox-esr | source | bookworm | 128.6.0esr-1~deb12u1 | DSA-5839-1 | ||
| firefox-esr | source | (unstable) | 128.6.0esr-1 | |||
| thunderbird | source | (unstable) | 1:128.6.0esr-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2025-01/#CVE-2025-0243
https://www.mozilla.org/en-US/security/advisories/mfsa2025-02/#CVE-2025-0243
https://www.mozilla.org/en-US/security/advisories/mfsa2025-05/#CVE-2025-0243