CVE-2013-5599: Mozilla Firefox

High severity, CVSS 10.0. EPSS: 5.2% chance of exploitation in the next 30 days.

Use-after-free vulnerability in the nsIPresShell::GetPresContext function in the PresShell (aka presentation shell) implementation in Mozilla Firefox before 25.0, Firefox ESR 17.x before 17.0.10 and 24.x before 24.1, Thunderbird before 24.1, Thunderbird ESR 17.x before 17.0.10, and SeaMonkey before 2.22 allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption and application crash) via vectors involving a CANVAS element, a mozTextStyle attribute, and an onresize event.

Affected products

• Mozilla Firefox: up to and including 24.0; version 19.0 only; version 19.0.1 only; version 19.0.2 only; version 20.0 only; version 20.0.1 only; …
• Mozilla Seamonkey: up to and including 2.22; version 2.0 only; version 2.0.1 only; version 2.0.2 only; version 2.0.3 only; version 2.0.4 only; …
• Mozilla Thunderbird: up to and including 24.0.1; version 17.0 only; version 17.0.1 only; version 17.0.2 only; version 17.0.3 only; version 17.0.4 only; …
• Mozilla Thunderbird ESR: version 17.0 only; version 17.0.1 only; version 17.0.2 only; version 17.0.3 only; version 17.0.4 only; version 17.0.5 only; …

Published 2013-10-30. Last modified 2026-06-16.