CVE-2021-23995

NameCVE-2021-23995
DescriptionWhen Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2632-1, DLA-2633-1, DSA-4895-1, DSA-4897-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid90.0-1fixed
firefox-esr (PTS)stretch68.10.0esr-1~deb9u1vulnerable
stretch (security)78.12.0esr-1~deb9u1fixed
buster78.11.0esr-1~deb10u1fixed
buster (security)78.12.0esr-1~deb10u1fixed
bullseye, sid78.12.0esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1vulnerable
stretch (security)1:78.12.0-1~deb9u1fixed
buster1:78.6.0-1~deb10u1vulnerable
buster (security)1:78.12.0-1~deb10u1fixed
bullseye, sid1:78.12.0-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)88.0-1
firefox-esrsourcestretch78.10.0esr-1~deb9u1DLA-2633-1
firefox-esrsourcebuster78.10.0esr-1~deb10u1DSA-4895-1
firefox-esrsource(unstable)78.10.0esr-1
thunderbirdsourcestretch1:78.10.0-1~deb9u1DLA-2632-1
thunderbirdsourcebuster1:78.10.0-1~deb10u1DSA-4897-1
thunderbirdsource(unstable)1:78.10.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-14/#CVE-2021-23995
https://www.mozilla.org/en-US/security/advisories/mfsa2021-15/#CVE-2021-23995
https://www.mozilla.org/en-US/security/advisories/mfsa2021-16/#CVE-2021-23995

Search for package or bug name: Reporting problems