VULNERABILITY INTELLIGENCE

CVE-2009-2408

CVSS score5.9 MEDIUM
EPSS probability5.74%
CISA KEVNot currently listed
Published2009-07-30
Last modified2026-06-16
CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Description

Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority. NOTE: this was originally reported for Firefox before 3.5.

Weakness classification

  • CWE-295: Improper Certificate Validation

Primary references