CVE-2024-0743
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.
02 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.
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
- Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
- EPSS probability
- 1.28% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 69.7% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2024-01-23 13:48Z2 YR AGO
- Last updated
- 2025-11-03 21:51Z11 MO AGO
- Reserved
- 2024-01-19
- Assigning CNA
- mozilla
- Record state
- PUBLISHED
- Severity
- High (CVSS 7.5)
- CNA CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-252Unchecked Return ValueBase
- Data version
- 5.2
- Document digest
- ca4ee3bf2b3e56d42fbd5264600fc4e1a52035e19577fe256ece21dac41e3e0d
05 Affected products
06 References
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1867408
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/03/msg00010.html
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2024-01/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2024-13/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2024-14/
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/03/msg00028.html
- lists.debian.orghttps://lists.debian.org/debian-lts-announce/2024/10/msg00028.html
07 Fixed in
AlmaLinux 8
- firefox Fixed in 115.9.1-1.el8_9.alma.1
- thunderbird Fixed in 115.9.0-1.el8_9.alma.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- firefox Fixed in 115.9.1-1.el9_3.alma.1
- firefox-x11 Fixed in 115.9.1-1.el9_3.alma.1
- thunderbird Fixed in 115.9.0-1.el9_3.alma.1
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 8
- firefox Fixed in 115.9.1-1.el8_9.alma.1
- thunderbird Fixed in 115.9.0-1.el8_9.alma.1
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- firefox Fixed in 115.9.1-1.el9_3.alma.1
- firefox-x11 Fixed in 115.9.1-1.el9_3.alma.1
- thunderbird Fixed in 115.9.0-1.el9_3.alma.1
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- firefox-esr Fixed in 115.9.0esr-1~deb12u1
- nss Fixed in 2:3.87.1-1+deb12u1
- thunderbird Fixed in 1:115.9.0-1~deb12u1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- firefox-esr Fixed in 115.9.0esr-1
- nss Fixed in 2:3.96.1-1
- thunderbird Fixed in 1:115.9.0-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- firefox-esr Fixed in 115.9.0esr-1
- nss Fixed in 2:3.96.1-1
- thunderbird Fixed in 1:115.9.0-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- mozjs38 No fix yet
- mozjs52 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- firefox Fixed in 122.0+build2-0ubuntu0.20.04.1
- mozjs52 No fix yet
- mozjs68 No fix yet
- thunderbird Fixed in 1:115.9.0+build1-0ubuntu0.20.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- mozjs102 No fix yet
- mozjs78 No fix yet
- mozjs91 No fix yet
- thunderbird Fixed in 1:115.9.0+build1-0ubuntu0.22.04.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 24.04 LTS
- mozjs102 No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.