Vulnerabilities > CVE-2020-26950 - Use After Free vulnerability in Mozilla Firefox ESR
Attack vector
NETWORK Attack complexity
LOW Privileges required
NONE Confidentiality impact
HIGH Integrity impact
HIGH Availability impact
HIGH Summary
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.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
References
- http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html
- http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675905
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675905
- https://www.mozilla.org/security/advisories/mfsa2020-49/
- https://www.mozilla.org/security/advisories/mfsa2020-49/