What’s Vulnerable › Vulnerabilities

CVE-2023-3600: Use-after-free in workers

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-12 · updated 2026-10-23
• Weakness: CWE-416

Description

During the worker lifecycle, a use-after-free condition could have occurred, which could have led to a potentially exploitable crash. This vulnerability affects Firefox < 115.0.2, Firefox ESR < 115.0.2, and Thunderbird < 115.0.1.

Affected products

• Mozilla Firefox: before 115.0.2 — fixed in 115.0.2
• Mozilla Firefox ESR: before 115.0.2 — fixed in 115.0.2
• Mozilla Thunderbird: before 115.0.1 — fixed in 115.0.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 115.0.2; Mozilla Firefox ESR 115.0.2; Mozilla Thunderbird 115.0.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1839703
• https://www.mozilla.org/security/advisories/mfsa2023-26/
• https://www.mozilla.org/security/advisories/mfsa2023-27/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1839703
• https://www.mozilla.org/security/advisories/mfsa2023-26/
• https://www.mozilla.org/security/advisories/mfsa2023-27/

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