CVE-2021-23987

NameCVE-2021-23987
DescriptionMozilla developers and community members reported memory safety bugs present in Firefox 86 and Firefox ESR 78.8. 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 ESR < 78.9, Thunderbird < 78.9, and Firefox < 87.
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-2607-1, DLA-2609-1, DSA-4874-1, DSA-4876-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
firefox (PTS)sid87.0-2fixed
firefox-esr (PTS)stretch68.10.0esr-1~deb9u1vulnerable
stretch (security)78.9.0esr-1~deb9u1fixed
buster78.8.0esr-1~deb10u1vulnerable
buster (security)78.9.0esr-1~deb10u1fixed
bullseye, sid78.9.0esr-1fixed
thunderbird (PTS)stretch1:68.10.0-1~deb9u1vulnerable
stretch (security)1:78.9.0-1~deb9u1fixed
buster1:78.6.0-1~deb10u1vulnerable
buster (security)1:78.9.0-1~deb10u1fixed
bullseye, sid1:78.9.0-1fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
firefoxsource(unstable)87.0-1
firefox-esrsourcestretch78.9.0esr-1~deb9u1DLA-2607-1
firefox-esrsourcebuster78.9.0esr-1~deb10u1DSA-4874-1
firefox-esrsource(unstable)78.9.0esr-1
thunderbirdsourcestretch1:78.9.0-1~deb9u1DLA-2609-1
thunderbirdsourcebuster1:78.9.0-1~deb10u1DSA-4876-1
thunderbirdsource(unstable)1:78.9.0-1

Notes

https://www.mozilla.org/en-US/security/advisories/mfsa2021-10/#CVE-2021-23987
https://www.mozilla.org/en-US/security/advisories/mfsa2021-11/#CVE-2021-23987
https://www.mozilla.org/en-US/security/advisories/mfsa2021-12/#CVE-2021-23987

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