CVE-2014-1551: Mozilla Firefox

High severity, CVSS 10.0. EPSS: 4.7% chance of exploitation in the next 30 days.

Use-after-free vulnerability in the FontTableRec destructor in Mozilla Firefox before 31.0, Firefox ESR 24.x before 24.7, and Thunderbird before 24.7 on Windows allows remote attackers to execute arbitrary code via crafted use of fonts in MathML content, leading to improper handling of a DirectWrite font-face object.

Affected products

• Mozilla Firefox: up to and including 30.0; version 24.0 only; version 24.0.1 only; version 24.0.2 only; version 24.1.0 only; version 24.1.1 only
• Mozilla Firefox ESR: version 24.2 only; version 24.3 only; version 24.4 only; version 24.5 only; version 24.6 only
• Mozilla Thunderbird: up to and including 24.6; version 24.0 only; version 24.0.1 only; version 24.1 only; version 24.1.1 only; version 24.2 only; …

Published 2014-07-23. Last modified 2026-06-17.