CVE-2014-1567: Mozilla Firefox

High severity, CVSS 9.3. EPSS: 4.9% chance of exploitation in the next 30 days.

Use-after-free vulnerability in DirectionalityUtils.cpp in Mozilla Firefox before 32.0, Firefox ESR 24.x before 24.8 and 31.x before 31.1, and Thunderbird 24.x before 24.8 and 31.x before 31.1 allows remote attackers to execute arbitrary code via text that is improperly handled during the interaction between directionality resolution and layout.

Affected products

• Mozilla Firefox: up to and including 31.1.0; version 30.0 only; version 31.0 only; version 24.0 only; version 24.0.1 only; version 24.0.2 only; …
• Mozilla Firefox ESR: version 24.2 only; version 24.3 only; version 24.4 only; version 24.5 only; version 24.6 only; version 24.7 only
• Mozilla Thunderbird: version 24.0 only; version 24.0.1 only; version 24.1 only; version 24.1.1 only; version 24.2 only; version 24.3 only; …

Published 2014-09-03. Last modified 2026-06-17.