CVEvulnerability
CVE-2021-23995
8.8 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-06-24
- 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])
- 5.1 MEDIUM — AV:N/AC:H/Au:N/C:P/I:P/A:P
- Weaknesses
- CWE-672
Description
When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
Affected configurations
• mozilla firefox (< 88.0)
• mozilla firefox esr (< 78.10)
• mozilla thunderbird (< 78.10)
Related
Weakness · CWE (1)
- CWE-672 Operation on a Resource after Expiration or Release weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1699835 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/ Release Notes, Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1699835 Issue Tracking, Permissions Required, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-14/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-15/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-16/ Release Notes, Vendor Advisory