What’s Vulnerable › Vulnerabilities

CVE-2024-3861

• Severity: medium (CVSS 4.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% 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-416

Description

If an AlignedBuffer were assigned to itself, the subsequent self-move could result in an incorrect reference count and later use-after-free. This vulnerability affects Firefox < 125, Firefox ESR < 115.10, and Thunderbird < 115.10.

Affected products

• Debian Linux: 10.0
• Mozilla Firefox: before 115.0; before 125.0 — fixed in 115.0, 125.0
• Mozilla Thunderbird: before 115.0 — fixed in 115.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.0, 125.0; Mozilla Thunderbird 115.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1883158
• https://lists.debian.org/debian-lts-announce/2024/04/msg00012.html
• https://lists.debian.org/debian-lts-announce/2024/04/msg00013.html
• https://www.mozilla.org/security/advisories/mfsa2024-18/
• https://www.mozilla.org/security/advisories/mfsa2024-19/
• https://www.mozilla.org/security/advisories/mfsa2024-20/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1883158
• https://lists.debian.org/debian-lts-announce/2024/04/msg00012.html
• https://lists.debian.org/debian-lts-announce/2024/04/msg00013.html
• https://www.mozilla.org/security/advisories/mfsa2024-18/
• https://www.mozilla.org/security/advisories/mfsa2024-19/
• https://www.mozilla.org/security/advisories/mfsa2024-20/

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