What’s Vulnerable › Vulnerabilities

CVE-2024-3855

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-04-16 · updated 2026-06-17
• Weakness: CWE-125

Description

In certain cases the JIT incorrectly optimized MSubstr operations, which led to out-of-bounds reads. This vulnerability affects Firefox < 125.

Affected products

• Mozilla Firefox: before 125.0 — fixed in 125.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 125.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1885828
• https://www.mozilla.org/security/advisories/mfsa2024-18/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1885828
• https://www.mozilla.org/security/advisories/mfsa2024-18/

Get alerted when CVE-2024-3855 or the next vulnerability affects your stack