Vulnerability Details : 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 have been used for spoofing attacks. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.

Published 2021-12-08 22:15:10

Updated 2022-12-09 15:55:14

Source Mozilla Corporation

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-43538

Probability of exploitation activity in the next 30 days: 0.12%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 45 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-43538

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Source
4.3	MEDIUM	AV:N/AC:M/Au:N/C:N/I:P/A:N	8.6	2.9	nvd@nist.gov
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: None Integrity Impact: Partial Availability Impact: None
4.3	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N	2.8	1.4	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: Low Availability: None

CWE ids for CVE-2021-43538

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-43538

https://lists.debian.org/debian-lts-announce/2022/01/msg00001.html

[SECURITY] [DLA 2874-1] thunderbird security update
Mailing List;Third Party Advisory

CVEs referencing this url
https://lists.debian.org/debian-lts-announce/2021/12/msg00030.html

[SECURITY] [DLA 2863-1] firefox-esr security update
Mailing List;Third Party Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-53/

Security Vulnerabilities fixed in Firefox ESR 91.4.0 — Mozilla
Vendor Advisory

CVEs referencing this url
https://www.debian.org/security/2021/dsa-5026

Debian -- Security Information -- DSA-5026-1 firefox-esr
Third Party Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/202202-03

Mozilla Firefox: Multiple vulnerabilities (GLSA 202202-03) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://bugzilla.mozilla.org/show_bug.cgi?id=1739091

Access Denied
Issue Tracking;Permissions Required;Vendor Advisory
https://www.debian.org/security/2022/dsa-5034

Debian -- Security Information -- DSA-5034-1 thunderbird
Third Party Advisory

CVEs referencing this url
https://security.gentoo.org/glsa/202208-14

Mozilla Thunderbird: Multiple Vulnerabilities (GLSA 202208-14) — Gentoo security
Third Party Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-54/

Security Vulnerabilities fixed in Thunderbird 91.4.0 — Mozilla
Vendor Advisory

CVEs referencing this url
https://www.mozilla.org/security/advisories/mfsa2021-52/

Security Vulnerabilities fixed in Firefox 95 — Mozilla
Vendor Advisory

CVEs referencing this url

Products affected by CVE-2021-43538

Debian » Debian Linux » Version: 9.0
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
Matching versions
Debian » Debian Linux » Version: 10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
Matching versions
Debian » Debian Linux » Version: 11.0
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
Matching versions
Mozilla » Firefox
Versions before (<) 95.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Matching versions
Mozilla » Thunderbird
Versions before (<) 91.4.0
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
Matching versions
Mozilla » Firefox Esr
Versions before (<) 91.4.0
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
Matching versions