CVEvulnerability
CVE-2021-23978
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
- Weaknesses
- CWE-787
Description
Mozilla developers reported memory safety bugs present in Firefox 85 and Firefox ESR 78.7. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 86, Thunderbird < 78.8, and Firefox ESR < 78.8.
Affected configurations
• mozilla firefox (< 86.0)
• mozilla firefox esr (< 78.8)
• mozilla thunderbird (< 78.8)
• debian debian linux 9.0
• debian debian linux 10.0
Related
Weakness · CWE (1)
- CWE-787 Out-of-bounds Write weakness
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=786797%2C1682928%2C1687391%2C1687597 Broken Link, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202104-09 Third Party Advisory
- https://security.gentoo.org/glsa/202104-10 Third Party Advisory
- https://www.debian.org/security/2021/dsa-4866 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-07/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-08/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-09/ Release Notes, Vendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=786797%2C1682928%2C1687391%2C1687597 Broken Link, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/03/msg00000.html Mailing List, Third Party Advisory
- https://security.gentoo.org/glsa/202104-09 Third Party Advisory
- https://security.gentoo.org/glsa/202104-10 Third Party Advisory
- https://www.debian.org/security/2021/dsa-4866 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-07/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-08/ Release Notes, Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-09/ Release Notes, Vendor Advisory