CVE-2021-29980
Mozilla: Uninitialized memory in a canvas object could have led to memory corruption
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · August 10, 2021
Updated · November 22, 2025
Description
Uninitialized memory in a canvas object could have caused an incorrect free() leading to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
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 3.1 · 8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-908 · Use of Uninitialized Resource