CVEvulnerability
CVE-2021-43542
6.5 MEDIUM
Official page ↗
- Status
- Modified
- Published
- 2021-12-08
- Last modified
- 2026-06-17
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- CVSS 2.0 ([email protected])
- 4.3 MEDIUM — AV:N/AC:M/Au:N/C:P/I:N/A:N
- Weaknesses
- CWE-209
Description
Using XMLHttpRequest, an attacker could have identified installed applications by probing error messages for loading external protocols. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
Affected configurations
• mozilla firefox (< 95.0)
• mozilla firefox esr (< 91.4.0)
• mozilla thunderbird (< 91.4.0)
• debian debian linux 9.0
• debian debian linux 10.0
• debian debian linux 11.0
Related
Weakness · CWE (1)
- CWE-209 Generation of Error Message Containing Sensitive Information weakness
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1723281 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://security.gentoo.org/glsa/202202-03 Third Party Advisory
- https://security.gentoo.org/glsa/202208-14 Third Party Advisory
- https://www.debian.org/security/2021/dsa-5026 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-52/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-53/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-54/ Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1723281 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://security.gentoo.org/glsa/202202-03 Third Party Advisory
- https://security.gentoo.org/glsa/202208-14 Third Party Advisory
- https://www.debian.org/security/2021/dsa-5026 Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034 Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-52/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-53/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-54/ Vendor Advisory