| Name | CVE-2021-23978 |
| Description | Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. 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 < 86, Thunderbird < 78.8, and Firefox ESR < 78.8. |
| 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-2575-1, DLA-2578-1, DSA-4862-1, DSA-4866-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 133.0.3-1 | fixed |
| firefox-esr (PTS) | bullseye | 115.14.0esr-1~deb11u1 | fixed |
| bullseye (security) | 128.5.0esr-1~deb11u1 | fixed | |
| bookworm | 128.3.1esr-1~deb12u1 | fixed | |
| bookworm (security) | 128.5.0esr-1~deb12u1 | fixed | |
| trixie | 128.5.0esr-1 | fixed | |
| sid | 128.5.1esr-1 | fixed | |
| thunderbird (PTS) | bullseye | 1:115.12.0-1~deb11u1 | fixed |
| bullseye (security) | 1:128.5.0esr-1~deb11u1 | fixed | |
| bookworm | 1:115.16.0esr-1~deb12u1 | fixed | |
| bookworm (security) | 1:128.5.0esr-1~deb12u1 | fixed | |
| sid, trixie | 1:128.5.2esr-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) | 86.0-1 | |||
| firefox-esr | source | stretch | 78.8.0esr-1~deb9u1 | DLA-2575-1 | ||
| firefox-esr | source | buster | 78.8.0esr-1~deb10u1 | DSA-4862-1 | ||
| firefox-esr | source | (unstable) | 78.8.0esr-1 | |||
| thunderbird | source | stretch | 1:78.8.0-1~deb9u1 | DLA-2578-1 | ||
| thunderbird | source | buster | 1:78.8.0-1~deb10u1 | DSA-4866-1 | ||
| thunderbird | source | (unstable) | 1:78.8.0-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2021-07/#CVE-2021-23978
https://www.mozilla.org/en-US/security/advisories/mfsa2021-08/#CVE-2021-23978
https://www.mozilla.org/en-US/security/advisories/mfsa2021-09/#CVE-2021-23978