What’s Vulnerable › Vulnerabilities

CVE-2012-3962

• Severity: critical (CVSS 9.3 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2012-08-29 · updated 2026-06-16

Description

Mozilla Firefox before 15.0, Firefox ESR 10.x before 10.0.7, Thunderbird before 15.0, Thunderbird ESR 10.x before 10.0.7, and SeaMonkey before 2.12 do not properly iterate through the characters in a text run, which allows remote attackers to execute arbitrary code via a crafted document.

Affected products

• Mozilla Firefox: through 14.0; 10.0, 10.0.1, 10.0.2, 10.0.3, 10.0.4, 10.0.5 (+144)
• Mozilla Seamonkey: through 2.11; 2.0, 2.0-alpha_1, 2.0-alpha_2, 2.0-alpha_3, 2.0-beta_1, 2.0-beta_2 (+72)
• Mozilla Thunderbird: through 14.0; 1.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5 (+95)
• Mozilla Thunderbird ESR: 10.0, 10.0.1, 10.0.2, 10.0.3, 10.0.4, 10.0.5 (+1)

References

• http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00028.html
• http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00011.html
• http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00014.html
• http://rhn.redhat.com/errata/RHSA-2012-1210.html
• http://rhn.redhat.com/errata/RHSA-2012-1211.html
• http://www.debian.org/security/2012/dsa-2553
• http://www.debian.org/security/2012/dsa-2554
• http://www.debian.org/security/2012/dsa-2556
• http://www.mozilla.org/security/announce/2012/mfsa2012-58.html
• http://www.ubuntu.com/usn/USN-1548-1
• http://www.ubuntu.com/usn/USN-1548-2
• http://www.xerox.com/download/security/security-bulletin/16287-4d6b7b0c81f7b/cert_XRX13-003_v1.0.pdf

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