CVEvulnerability
CVE-2020-26950
8.8 HIGH
Official page ↗
- Status
- Modified
- Published
- 2020-12-09
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 8.8 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- CVSS 2.0 ([email protected])
- 9.3 HIGH — AV:N/AC:M/Au:N/C:C/I:C/A:C
- Weaknesses
- CWE-416
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.
Affected configurations
• mozilla firefox (< 82.0.3)
• mozilla firefox esr (< 78.4.1)
• mozilla thunderbird (< 78.4.2)
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html Exploit, Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675905 Exploit, Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-49/ Vendor Advisory
- http://packetstormsecurity.com/files/166175/Firefox-MCallGetProperty-Write-Side-Effects-Use-After-Free.html Exploit, Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675905 Exploit, Issue Tracking, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-49/ Vendor Advisory