CVE-2020-15669

HIGH

Firefox ESR < 68.12 and Thunderbird < 68.12 - Use-After-Free via Abort Signal Handling

Title source: llm

Description

When aborting an operation, such as a fetch, an abort signal may be deleted while alerting the objects to be notified. This results in a use-after-free and we presume that with enough effort it could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 68.12 and Thunderbird < 68.12.

References (3)

Core 3

Core References

Release Notes, Vendor Advisory x_refsource_misc

https://www.mozilla.org/security/advisories/mfsa2020-40/

Release Notes, Vendor Advisory x_refsource_misc

https://www.mozilla.org/security/advisories/mfsa2020-37/

Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc

https://bugzilla.mozilla.org/show_bug.cgi?id=1656957

Scores

CVSS v3 8.8

EPSS 0.0045

EPSS Percentile 63.8%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE

CWE-416

Status published

Products (2)

mozilla/firefox_esr < 68.12

mozilla/thunderbird < 68.12

Published Oct 01, 2020

Tracked Since Feb 18, 2026