CVE-2024-0743highCWE-252

CVE-2024-0743: high-severity vulnerability in Mozilla Firefox

Published 23 Jan 2024 · Updated 03 Nov 2025

Follow this CVE + Monitor Firefox + Monitor Thunderbird

E-mail alert when it lands in KEV, gets a public PoC or its score goes up.

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 1.3%

An unchecked return value in TLS handshake code could have caused a potentially exploitable crash. This vulnerability affects Firefox < 122, Firefox ESR < 115.9, and Thunderbird < 115.9.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Mozilla · Firefox Mozilla · Firefox ESR Mozilla · Thunderbird

Related CVEs — Mozilla Firefox

In the same product, most dangerous first.

CVE-2016-9079HIGHCVE-2016-9079EPSS 87.4%KEV CVE-2019-11708CRITICALCVE-2019-11708EPSS 55.9%KEV CVE-2019-17026HIGHCVE-2019-17026EPSS 46.3%KEV CVE-2019-11707HIGHCVE-2019-11707EPSS 38.0%KEV CVE-2024-9680CRITICALCVE-2024-9680EPSS 23.2%KEV CVE-2022-26485HIGHCVE-2022-26485EPSS 14.3%KEV

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1867408 https://lists.debian.org/debian-lts-announce/2024/03/msg00010.html https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html https://lists.debian.org/debian-lts-announce/2024/10/msg00028.html https://www.mozilla.org/security/advisories/mfsa2024-01/https://www.mozilla.org/security/advisories/mfsa2024-13/https://www.mozilla.org/security/advisories/mfsa2024-14/