CVE-2021-29970

HIGH

Thunderbird <78.12, Firefox ESR <78.12, Firefox <90 - Use After Free

Title source: llm
STIX 2.1

Description

A malicious webpage could have triggered a use-after-free, memory corruption, and a potentially exploitable crash. *This bug could only be triggered when accessibility was enabled.*. This vulnerability affects Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.

References (6)

Core 6
Core References
Exploit, Issue Tracking, Vendor Advisory x_refsource_misc
https://bugzilla.mozilla.org/show_bug.cgi?id=1709976
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202202-03
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202208-14

Scores

CVSS v3 8.8
EPSS 0.0074
EPSS Percentile 73.2%
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 CWE-787
Status published
Products (3)
mozilla/firefox < 90.0
mozilla/firefox_esr < 78.12
mozilla/thunderbird < 78.12
Published Aug 05, 2021
Tracked Since Feb 18, 2026