CVE-2009-2404: Mozilla Network Security Services

High severity, CVSS 9.3. EPSS: 4.2% chance of exploitation in the next 30 days.

Heap-based buffer overflow in a regular-expression parser in Mozilla Network Security Services (NSS) before 3.12.3, as used in Firefox, Thunderbird, SeaMonkey, Evolution, Pidgin, and AOL Instant Messenger (AIM), allows remote SSL servers to cause a denial of service (application crash) or possibly execute arbitrary code via a long domain name in the subject's Common Name (CN) field of an X.509 certificate, related to the cert_TestHostName function.

Affected products

• Mozilla Network Security Services: version 3.12.3 only

Published 2009-08-03. Last modified 2026-06-16.