What’s Vulnerable › Vulnerabilities

CVE-2012-4191

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-10-12 · updated 2026-06-16
• Weakness: CWE-787

Description

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: 10.04, 11.04, 11.10, 12.04
• 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

How to fix

Upgrade to a fixed version: Mozilla Firefox 16.0.1; Mozilla Seamonkey 2.13.1; Mozilla Thunderbird 16.0.1. Check the vendor advisory for mitigations.

References

• http://osvdb.org/86125
• http://secunia.com/advisories/50904
• http://secunia.com/advisories/50929
• http://secunia.com/advisories/50984
• http://www.mozilla.org/security/announce/2012/mfsa2012-88.html
• http://www.securitytracker.com/id?1027653
• http://www.ubuntu.com/usn/USN-1608-1
• http://www.ubuntu.com/usn/USN-1611-1
• https://bugzilla.mozilla.org/show_bug.cgi?id=798045
• https://exchange.xforce.ibmcloud.com/vulnerabilities/79209
• https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16719
• http://osvdb.org/86125

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