7.5

CVE-2024-0743: mozilla firefox Unchecked Return Value

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2024-0743DEBIAN-CVE-2024-0743CGA-4r62-3935-f68v
Published 23-01-2024Last modified 03-11-2025
Open JSON

Vulnerability summary

CVE-2024-0743 is a high (CVSS 7.5) Unchecked Return Value vulnerability in mozilla firefox. EPSS estimates a 1.29% chance of exploitation in the next 30 days, higher than 69.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
1.29%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 35 · Related 9
DLA-3757-1DLA-3769-1DLA-3775-1DLA-3937-1DSA-5643-1DSA-5644-1

Timeline

  1. 23-01-2024
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

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.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

1.29%

Chance of exploitation in the next 30 days

Percentile

70%

Versus all other CVEs

30-day change

0.00 pp

From 1.29% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.29%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu8 products
  • firefox< 122.0+build2-0ubuntu0.20.04.1
  • mozjs102All versions (No fix recorded)
  • mozjs38All versions (No fix recorded)
  • mozjs52All versions (No fix recorded)
  • mozjs68All versions (No fix recorded)
Debian3 products
  • firefox-esr< 115.9.0esr-1~deb12u1 | < 115.9.0esr-1
  • nss< 2:3.87.1-1+deb12u1 | < 2:3.96.1-1
  • thunderbird< 1:115.9.0-1~deb12u1 | < 1:115.9.0-1
Mozilla3 products
Chainguard1 product
  • firefox-esr< 122.0-r0

4 vendors · 15 products

References

14 links
Show all 14 references