What’s Vulnerable › Vulnerabilities

CVE-2025-3608: Race condition in nsHttpTransaction could lead to memory corruption

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-04-15 · updated 2026-09-30
• Weakness: CWE-362

Description

A race condition existed in nsHttpTransaction that could have been exploited to cause memory corruption, potentially leading to an exploitable condition. This vulnerability was fixed in Firefox 137.0.2.

Affected products

• Mozilla Firefox: before 137.0.2 — fixed in 137.0.2

How to fix

Upgrade to a fixed version: Mozilla Firefox 137.0.2. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1951554
• https://www.cve.org/CVERecord?id=CVE-2025-3608
• https://www.mozilla.org/security/advisories/mfsa2025-25/

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