CVE-2012-4191: Canonical Ubuntu Linux

High severity, CVSS 9.3. EPSS: 3.9% chance of exploitation in the next 30 days.

The mozilla::net::FailDelayManager::Lookup function in the WebSockets implementation in Mozilla Firefox before 16.0.1, Thunderbird before 16.0.1, and SeaMonkey before 2.13.1 allows remote attackers to cause a denial of service (memory corruption and application crash) or possibly execute arbitrary code via unspecified vectors.

Affected products

• Canonical Ubuntu Linux: version 10.04 only; version 11.04 only; version 11.10 only; version 12.04 only
• Mozilla Firefox: before 16.0.1 (fixed in 16.0.1)
• Mozilla Seamonkey: before 2.13.1 (fixed in 2.13.1)
• Mozilla Thunderbird: before 16.0.1 (fixed in 16.0.1)

Published 2012-10-12. Last modified 2026-06-16.