CVE-2021-43535 Information

Description

A use-after-free could have occured when an HTTP2 session object was released on a different thread leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93 Thunderbird < 91.3 and Firefox ESR < 91.3.

CVSS Vector

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

Reference

https://www.mozilla.org/security/advisories/mfsa2021-50/ https://www.mozilla.org/security/advisories/mfsa2021-43/ https://www.mozilla.org/security/advisories/mfsa2021-49/ https://bugzilla.mozilla.org/show_bug.cgi?id=1667102 https://www.debian.org/security/2021/dsa-5026 https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html https://www.debian.org/security/2022/dsa-5034 https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

8.8