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CVE-2021-43535

CVE-2021-43535

EPSS 1.1%
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.
Affected products
Mozilla · FirefoxMozilla · Firefox ESRMozilla · Thunderbird

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References
https://bugzilla.mozilla.org/show_bug.cgi?id=1667102https://lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlhttps://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlhttps://www.debian.org/security/2021/dsa-5026https://www.debian.org/security/2022/dsa-5034https://www.mozilla.org/security/advisories/mfsa2021-43/https://www.mozilla.org/security/advisories/mfsa2021-49/https://www.mozilla.org/security/advisories/mfsa2021-50/