Description

In certain circumstances, the MCallGetProperty opcode can be emitted with unmet assumptions resulting in an exploitable use-after-free condition. This vulnerability affects Firefox < 82.0.3, Firefox ESR < 78.4.1, and Thunderbird < 78.4.2.

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1675905

https://www.mozilla.org/security/advisories/mfsa2020-49/

http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html

Details

Risk Information

CVSS v2

CVSS v3