| Name | CVE-2021-23973 |
| Description | When trying to load a cross-origin resource in an audio/video context a decoding error may have resulted, and the content of that error may have revealed information about the resource. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, 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 | 155.0.1-1 | fixed |
| firefox-esr (PTS) | bookworm | 140.12.0esr-1~deb12u1 | fixed |
| bookworm (security) | 140.15.0esr-1~deb12u1 | fixed | |
| trixie | 140.12.0esr-1~deb13u1 | fixed | |
| trixie (security) | 140.15.0esr-1~deb13u1 | fixed | |
| forky, sid | 140.15.0esr-1 | fixed | |
| thunderbird (PTS) | bookworm | 1:140.12.0esr-1~deb12u1 | fixed |
| bookworm (security) | 1:140.15.0esr-1~deb12u1 | fixed | |
| trixie | 1:140.12.0esr-1~deb13u1 | fixed | |
| trixie (security) | 1:140.15.0esr-1~deb13u1 | fixed | |
| forky | 1:140.14.0esr-1 | fixed | |
| sid | 1:153.2.0esr-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) | 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-2021-23973
https://www.mozilla.org/en-US/security/advisories/mfsa2021-08/#CVE-2021-23973
https://www.mozilla.org/en-US/security/advisories/mfsa2021-09/#CVE-2021-23973