| Name | CVE-2021-29976 |
| Description | Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. 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 Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-2709-1, DLA-2711-1, DSA-4939-1, DSA-4940-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 132.0.2-1 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | fixed |
| bullseye (security) | 128.4.0esr-1~deb11u1 | fixed | |
| bookworm | 128.3.1esr-1~deb12u1 | fixed | |
| bookworm (security) | 128.4.0esr-1~deb12u1 | fixed | |
| sid, trixie | 128.4.0esr-1 | fixed | |
| thunderbird (PTS) | bullseye | 1:115.12.0-1~deb11u1 | fixed |
| bullseye (security) | 1:128.4.3esr-1~deb11u1 | fixed | |
| bookworm | 1:115.16.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 1:128.4.3esr-1~deb12u1 | fixed | |
| sid, trixie | 1:128.4.3esr-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) | 90.0-1 | |||
| firefox-esr | source | stretch | 78.12.0esr-1~deb9u1 | DLA-2709-1 | ||
| firefox-esr | source | buster | 78.12.0esr-1~deb10u1 | DSA-4939-1 | ||
| firefox-esr | source | (unstable) | 78.12.0esr-1 | |||
| thunderbird | source | stretch | 1:78.12.0-1~deb9u1 | DLA-2711-1 | ||
| thunderbird | source | buster | 1:78.12.0-1~deb10u1 | DSA-4940-1 | ||
| thunderbird | source | (unstable) | 1:78.12.0-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2021-28/#CVE-2021-29976
https://www.mozilla.org/en-US/security/advisories/mfsa2021-29/#CVE-2021-29976
https://www.mozilla.org/en-US/security/advisories/mfsa2021-30/#CVE-2021-29976