| Name | CVE-2021-43535 |
| Description | A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more) |
| References | DLA-2863-1, DLA-2874-1, DSA-5026-1, DSA-5034-1 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| firefox (PTS) | sid | 111.0.1-1 | fixed |
| firefox-esr (PTS) | buster | 91.12.0esr-1~deb10u1 | fixed |
| buster (security) | 102.9.0esr-1~deb10u1 | fixed | |
| bullseye | 91.13.0esr-1~deb11u1 | fixed | |
| bullseye (security) | 102.9.0esr-1~deb11u1 | fixed | |
| bookworm, sid | 102.9.0esr-2 | fixed | |
| thunderbird (PTS) | buster | 1:91.12.0-1~deb10u1 | fixed |
| buster (security) | 1:102.9.0-1~deb10u1 | fixed | |
| bullseye | 1:91.13.0-1~deb11u1 | fixed | |
| bullseye (security) | 1:102.9.0-1~deb11u1 | fixed | |
| bookworm | 1:102.9.0-1 | fixed | |
| sid | 1:102.9.1-1 | 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) | 93.0-1 | |||
| firefox-esr | source | stretch | 91.4.1esr-1~deb9u1 | DLA-2863-1 | ||
| firefox-esr | source | bullseye | 91.4.1esr-1~deb11u1 | DSA-5026-1 | ||
| firefox-esr | source | (unstable) | 91.3.0esr-1 | |||
| thunderbird | source | stretch | 1:91.4.1-1~deb9u1 | DLA-2874-1 | ||
| thunderbird | source | buster | 1:91.4.1-1~deb10u1 | DSA-5034-1 | ||
| thunderbird | source | bullseye | 1:91.4.1-1~deb11u1 | DSA-5034-1 | ||
| thunderbird | source | (unstable) | 1:91.3.0-1 |
https://www.mozilla.org/en-US/security/advisories/mfsa2021-43/#CVE-2021-43535
https://www.mozilla.org/en-US/security/advisories/mfsa2021-49/#CVE-2021-43535
https://www.mozilla.org/en-US/security/advisories/mfsa2021-50/#CVE-2021-43535