Vulnerability Details : CVE-2021-43540

WebExtensions with the correct permissions were able to create and install ServiceWorkers for third-party websites that would not have been uninstalled with the extension. This vulnerability affects Firefox < 95.

Published 2021-12-08 22:15:10

Updated 2022-07-12 17:42:04

Source Mozilla Corporation

View at NVD, CVE.org

Exploit prediction scoring system (EPSS) score for CVE-2021-43540

Probability of exploitation activity in the next 30 days: 0.09%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 38 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-43540

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
6.5	MEDIUM	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N	2.8	3.6	nvd@nist.gov
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: None Integrity: High Availability: None

References for CVE-2021-43540

https://bugzilla.mozilla.org/show_bug.cgi?id=1636629

Access Denied
Issue Tracking;Permissions Required;Vendor Advisory
https://security.gentoo.org/glsa/202202-03

Mozilla Firefox: Multiple vulnerabilities (GLSA 202202-03) — Gentoo security
Third Party 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-2021-43540

Mozilla » Firefox
Versions before (<) 95.0
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Matching versions