CVE-2015-0803: Canonical Ubuntu Linux

High severity, CVSS 7.5. EPSS: 3.7% chance of exploitation in the next 30 days.

The HTMLSourceElement::AfterSetAttr function in Mozilla Firefox before 37.0 does not properly constrain the original data type of a casted value during the setting of a SOURCE element's attributes, which allows remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via a crafted HTML document.

Affected products

• Canonical Ubuntu Linux: version 12.04 only; version 14.04 only; version 14.10 only
• Mozilla Firefox: up to and including 36.0.4
• Opensuse Opensuse: version 13.1 only; version 13.2 only

Published 2015-04-01. Last modified 2026-06-17.