CVE-2007-0981: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 12.5% chance of exploitation in the next 30 days.

Mozilla based browsers, including Firefox before 1.5.0.10 and 2.x before 2.0.0.2, and SeaMonkey before 1.0.8, allow remote attackers to bypass the same origin policy, steal cookies, and conduct other attacks by writing a URI with a null byte to the hostname (location.hostname) DOM property, due to interactions with DNS resolver code.

Affected products

• Mozilla Firefox: up to and including 1.5.0.9; version 0.8 only; version 0.9 only; version 0.9.1 only; version 0.9.2 only; version 0.9.3 only; …
• Mozilla Seamonkey: up to and including 1.0.7; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …

Published 2007-02-16. Last modified 2026-06-16.