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.
Products affected by CVE-2021-43540
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-43540
0.09%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 38 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-43540
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
4.3
|
MEDIUM | AV:N/AC:M/Au:N/C:N/I:P/A:N |
8.6
|
2.9
|
NIST | |
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
|
NIST |
References for CVE-2021-43540
-
https://bugzilla.mozilla.org/show_bug.cgi?id=1636629
Access DeniedIssue Tracking;Permissions Required;Vendor Advisory
-
https://security.gentoo.org/glsa/202202-03
Mozilla Firefox: Multiple vulnerabilities (GLSA 202202-03) — Gentoo securityThird Party Advisory
-
https://www.mozilla.org/security/advisories/mfsa2021-52/
Security Vulnerabilities fixed in Firefox 95 — MozillaVendor Advisory
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