CVE-2005-2702: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 3.6% chance of exploitation in the next 30 days.

Firefox before 1.0.7 and Mozilla Suite before 1.7.12 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via Unicode sequences with "zero-width non-joiner" characters.

Affected products

• Mozilla Firefox: up to and including 1.0.6; version 1.0 only; version 1.0.1 only; version 1.0.2 only; version 1.0.3 only; version 1.0.4 only; …
• Mozilla Mozilla Suite: up to and including 1.7.11; version 1.7.6 only; version 1.7.7 only; version 1.7.8 only; version 1.7.10 only

Published 2005-09-23. Last modified 2026-06-16.