Remote Yes

Type Arbitrary code execution

Description

Firefox before version 91 and Thunderbird before version 78.13 incorrectly treated an inline list-item element as a block element, resulting in an out of bounds read or memory corruption, and a potentially exploitable crash.

AVG-2270 thunderbird 78.12.0-1 High Vulnerable

AVG-2269 firefox 90.0.2-1 High Vulnerable

https://www.mozilla.org/security/advisories/mfsa2021-33/
https://www.mozilla.org/security/advisories/mfsa2021-35/
https://bugzilla.mozilla.org/show_bug.cgi?id=1717922