Medium severity · published Dec 8, 2021
CVE-2021-43538
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…
4.3
CVSS
1.2%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
None
Integrity
Low
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.2% · higher than 69% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 95.0 · source: NVD
DL
Debian Linux · Debian
9.0; 10.0; 11.0 · source: NVD
FE
Firefox Esr · Mozilla
before 91.4.0 · source: NVD
TH
Thunderbird · Mozilla
before 91.4.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-43538
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-43538
Issue Tracking
https://bugzilla.mozilla.org/show_bug.cgi?id=1739091
Mailing List
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html
Mailing List
https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html
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
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