What’s Vulnerable › Vulnerabilities

CVE-2023-37209

• 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: 2023-07-05 · updated 2026-06-17
• Weakness: CWE-416

Description

A use-after-free condition existed in `NotifyOnHistoryReload` where a `LoadingSessionHistoryEntry` object was freed and a reference to that object remained. This resulted in a potentially exploitable condition when the reference to that object was later reused. This vulnerability affects Firefox < 115.

Affected products

• Mozilla Firefox: before 115.0 — fixed in 115.0

How to fix

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

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1837993
• https://security.gentoo.org/glsa/202401-10
• https://www.mozilla.org/security/advisories/mfsa2023-22/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1837993
• https://security.gentoo.org/glsa/202401-10
• https://www.mozilla.org/security/advisories/mfsa2023-22/

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