Vulnerability Description
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.
CVSS Score
6.5
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 95.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1636629Issue TrackingPermissions RequiredVendor Advisory
- https://security.gentoo.org/glsa/202202-03Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-52/Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1636629Issue TrackingPermissions RequiredVendor Advisory
- https://security.gentoo.org/glsa/202202-03Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2021-52/Vendor Advisory
FAQ
What is CVE-2021-43540?
CVE-2021-43540 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 F...
How severe is CVE-2021-43540?
CVE-2021-43540 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-43540?
Check the references section above for vendor advisories and patch information. Affected products include: Mozilla Firefox.