What’s Vulnerable › Vulnerabilities

CVE-2024-6603: Memory corruption in thread creation

• Severity: high (CVSS 7.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-09 · updated 2026-06-17
• Weakness: CWE-823

Description

In an out-of-memory scenario an allocation could fail but free would have been called on the pointer afterwards leading to memory corruption. This vulnerability affects Firefox < 128, Firefox ESR < 115.13, Thunderbird < 115.13, and Thunderbird < 128.

Affected products

• Mozilla Firefox: before 115.13; before 128.0 — fixed in 115.13, 128.0
• Mozilla Thunderbird: before 115.13; from 116.0 before 128.0 — fixed in 115.13, 128.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.13, 128.0; Mozilla Thunderbird 115.13, 128.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1895081
• https://www.mozilla.org/security/advisories/mfsa2024-29/
• https://www.mozilla.org/security/advisories/mfsa2024-30/
• https://www.mozilla.org/security/advisories/mfsa2024-31/
• https://www.mozilla.org/security/advisories/mfsa2024-32/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1895081
• https://www.mozilla.org/security/advisories/mfsa2024-29/
• https://www.mozilla.org/security/advisories/mfsa2024-30/
• https://www.mozilla.org/security/advisories/mfsa2024-31/
• https://www.mozilla.org/security/advisories/mfsa2024-32/

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