CVE-2021-23954 Information

Description

Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85 Thunderbird < 78.7 and Firefox ESR < 78.7.

CVSS Vector

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

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1684020 https://www.mozilla.org/security/advisories/mfsa2021-04/ https://www.mozilla.org/security/advisories/mfsa2021-05/ https://www.mozilla.org/security/advisories/mfsa2021-03/

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