CVE-2015-2731
Mozilla: Use-after-free in Content Policy due to microtask execution error (MFSA 2015-63)
Severity
CriticalRed Hat Product Security
CVSS 2.0
Review impact separately from score.
Published · July 2, 2015
Updated · November 21, 2025
Description
Use-after-free vulnerability in the CSPService::ShouldLoad function in the microtask implementation in Mozilla Firefox before 39.0, Firefox ESR 38.x before 38.1, and Thunderbird before 38.1 allows remote attackers to execute arbitrary code by leveraging client-side JavaScript that triggers removal of a DOM object on the basis of a Content Policy.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 2.0 · 6.8AV:N/AC:M/Au:N/C:P/I:P/A:P
CWE-416 · Use After Free