CVE-2021-43540
First published: Tue Dec 07 2021(Updated: )
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.
Credit: security@mozilla.org security@mozilla.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Firefox | <95 | 95 |
| Firefox | <95.0 |
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Reference Links
Peer vulnerabilities
(Found alongside the following vulnerabilities)
Frequently Asked Questions
What is the severity of CVE-2021-43540?
CVE-2021-43540 is classified as a moderate severity vulnerability that allows WebExtensions to improperly manage ServiceWorkers.
How do I fix CVE-2021-43540?
To mitigate CVE-2021-43540, users should update their Mozilla Firefox browser to version 96 or higher.
What are the potential impacts of CVE-2021-43540?
CVE-2021-43540 could allow third-party websites to retain ServiceWorkers even after the uninstallation of the associated WebExtension.
Which versions of Firefox are affected by CVE-2021-43540?
CVE-2021-43540 affects Mozilla Firefox versions prior to 96.
Who is responsible for addressing CVE-2021-43540?
Mozilla is responsible for addressing and patching CVE-2021-43540 in its Firefox browser.
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