CVE-2005-0399: Heap-based buffer overflow in GIF2.cpp in Firefox before 1.0.2, Mozilla before to 1.7.6, and Thunderbird be...

Security readout for executives and security teams

This is an old Mozilla-family image parsing flaw. A malicious GIF could trigger memory corruption and potentially run code in vulnerable Firefox, Mozilla, or Thunderbird versions. Business urgency is mainly for legacy environments, archived systems, or embedded packages still using those 2005-era components. Exposure is most likely on unsupported legacy desktops, servers with old Mozilla packages, or products embedding the affected library. Modern maintained browsers are unlikely to be exposed, but inherited enterprise images and old Unix/Linux distributions should be checked. Prioritize if the organization still operates legacy Mozilla-family software or old vendor-supported distributions. For fully modern endpoints, treat as a historical exposure check rather than an emergency incident response trigger. Mitigation focus: Upgrade Firefox to 1.0.2 or later where applicable.; Upgrade Mozilla Suite to 1.7.6 or later where applicable.; Upgrade Thunderbird to 1.0.2 or later where applicable..

Prepared

Jun 29, 2026, 23:12 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.