What’s Vulnerable › Vulnerabilities

CVE-2024-0743

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-01-23 · updated 2026-06-17
• Weakness: CWE-252

Description

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.

Affected products

• Mozilla Firefox: before 122.0 — fixed in 122.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 122.0. Check the vendor advisory for mitigations.

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://www.mozilla.org/security/advisories/mfsa2024-01/
• https://www.mozilla.org/security/advisories/mfsa2024-13/
• https://www.mozilla.org/security/advisories/mfsa2024-14/
• 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

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