Vulnerability Description
By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 95.0 |
| Mozilla | Firefox Esr | < 91.4.0 |
| Mozilla | Thunderbird | < 91.4.0 |
| Debian | Debian Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1739091Issue TrackingPermissions RequiredVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202202-03Third Party Advisory
- https://security.gentoo.org/glsa/202208-14Third Party Advisory
- https://www.debian.org/security/2021/dsa-5026Third Party Advisory
- https://www.debian.org/security/2022/dsa-5034Third 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=1739091Issue TrackingPermissions RequiredVendor Advisory
- https://lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlMailing ListThird Party Advisory
- https://security.gentoo.org/glsa/202202-03Third Party Advisory
- https://security.gentoo.org/glsa/202208-14Third Party Advisory
FAQ
What is CVE-2021-43538?
CVE-2021-43538 is a vulnerability with a CVSS score of 4.3 (MEDIUM). By misusing a race in our notification code, an attacker could have forcefully hidden the notification for pages that had received full screen and pointer lock access, which could have been used for s...
How severe is CVE-2021-43538?
CVE-2021-43538 has been rated MEDIUM with a CVSS base score of 4.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43538?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox, Mozilla Firefox Esr, Mozilla Thunderbird, Debian Debian Linux.