CVEvulnerability
CVE-2021-23960
8.8 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-02-26
- 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
Description
Performing garbage collection on re-declared JavaScript variables resulted in a user-after-poison, and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
Affected configurations
• mozilla firefox (< 85.0)
• mozilla firefox esr (< 78.7)
• mozilla thunderbird (< 78.7)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675755 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-03/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-04/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-05/ Release Notes, Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1675755 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-03/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-04/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-05/ Release Notes, Vendor Advisory