CVEvulnerability
CVE-2021-43535
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-416
Description
A use-after-free could have occured when an HTTP2 session object was released on a different thread, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.3, and Firefox ESR < 91.3.
Affected configurations
• mozilla firefox (< 93.0)
• 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-416 Use After Free weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1667102 Issue Tracking, Permissions Required, 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/mfsa2021-43/ 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/show_bug.cgi?id=1667102 Issue Tracking, Permissions Required, 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/mfsa2021-43/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-49/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-50/ Vendor Advisory