CVEvulnerability
CVE-2020-26959
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])
- 6.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-416
Description
During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.
Affected configurations
• mozilla firefox (< 83.0)
• mozilla firefox esr (< 78.5)
• mozilla thunderbird (< 78.5)
Related
Weakness · CWE (1)
- CWE-416 Use After Free weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1669466 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-50/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-51/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-52/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1669466 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-50/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-51/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2020-52/ Vendor Advisory