CVEvulnerability
CVE-2021-43534
8.8 HIGH
Official page ↗
- Status
- Modified
- Published
- 2021-12-08
- 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 and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. 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 < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
Affected configurations
• mozilla firefox (< 94.0)
• mozilla firefox esr (< 91.3.0)
• mozilla thunderbird (< 91.3.0)
• debian debian linux 9.0
• debian debian linux 10.0
• debian debian linux 11.0
Related
Weakness · CWE (1)
- CWE-787 Out-of-bounds Write weakness
References
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1606864%2C1712671%2C1730048%2C1735152 Broken Link, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory
- https://www.debian.org/security/2021/dsa-5026 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Issue Tracking, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-48/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-49/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-50/ Vendor Advisory
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1606864%2C1712671%2C1730048%2C1735152 Broken Link, Issue Tracking, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html Mailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html Mailing List, Third Party Advisory
- https://www.debian.org/security/2021/dsa-5026 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Issue Tracking, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-48/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-49/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-50/ Vendor Advisory