CVE-2021-38496

HIGH

Thunderbird <78.15, Firefox ESR <91.2, Firefox <93 - Memory Corruption

Title source: llm
STIX 2.1

Description

During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.

References (8)

Core 8
Core References
Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1725335
Issue Tracking, Third Party Advisory vendor-advisory x_refsource_debian
https://www.debian.org/security/2022/dsa-5034
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

Scores

CVSS v3 8.8
EPSS 0.0109
EPSS Percentile 78.2%
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 (6)
debian/debian_linux 9.0
debian/debian_linux 10.0
debian/debian_linux 11.0
mozilla/firefox < 93.0
mozilla/firefox_esr < 78.15
mozilla/thunderbird < 78.15
Published Nov 03, 2021
Tracked Since Feb 18, 2026