Memory corruption in the networking stack could have led to a potentially exploitable crash. This vulnerability affects Firefox < 125, Firefox ESR < 115.12, and Thunderbird < 115.12.
https://www.mozilla.org/security/advisories/mfsa2024-28/
https://www.mozilla.org/security/advisories/mfsa2024-26/
https://www.mozilla.org/security/advisories/mfsa2024-18/
https://lists.debian.org/debian-lts-announce/2024/06/msg00010.html
https://lists.debian.org/debian-lts-announce/2024/06/msg00000.html