What’s Vulnerable › Vulnerabilities

CVE-2012-4218

• Severity: critical (CVSS 10.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 5.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-11-21 · updated 2026-06-16
• Weakness: CWE-416

Description

Use-after-free vulnerability in the BuildTextRunsScanner::BreakSink::SetBreaks function in Mozilla Firefox before 17.0, Thunderbird before 17.0, and SeaMonkey before 2.14 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via unspecified vectors.

Affected products

• Canonical Ubuntu Linux: 10.04, 11.10, 12.04, 12.10
• Mozilla Firefox: before 17.0 — fixed in 17.0
• Mozilla Seamonkey: before 2.14 — fixed in 2.14
• Mozilla Thunderbird: before 17.0 — fixed in 17.0
• Opensuse: 11.4, 12.1, 12.2
• SUSE Linux Enterprise Server 15 SP1: 10-sp4, 11-sp2
• SUSE Linux Enterprise Server: 10-sp4, 11-sp2
• SUSE Linux Enterprise Software Development Kit: 11-sp2, 11-sp3

How to fix

Upgrade to a fixed version: Mozilla Firefox 17.0; Mozilla Seamonkey 2.14; Mozilla Thunderbird 17.0. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00021.html
• http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00022.html
• http://lists.opensuse.org/opensuse-updates/2012-11/msg00090.html
• http://lists.opensuse.org/opensuse-updates/2012-11/msg00092.html
• http://lists.opensuse.org/opensuse-updates/2012-11/msg00093.html
• http://secunia.com/advisories/51369
• http://secunia.com/advisories/51370
• http://secunia.com/advisories/51381
• http://secunia.com/advisories/51434
• http://secunia.com/advisories/51439
• http://secunia.com/advisories/51440
• http://www.mozilla.org/security/announce/2012/mfsa2012-105.html

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