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CVE-2021-43540

Date: December 8, 2021

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.

Severity Score

Related Resources (7)

https://www.mozilla.org/security/advisories/mfsa2021-52/
https://security.alpinelinux.org/vuln/CVE-2021-43540
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-43540
https://security.gentoo.org/glsa/202202-03
https://nvd.nist.gov/vuln/detail/CVE-2021-43540
https://bugzilla.mozilla.org/show_bug.cgi?id=1636629
https://www.mend.io/vulnerability-database/CVE-2021-43540

Severity Score

Weakness Type (CWE)

Insufficient Information

NVD-CWE-noinfo

Incorrect Permission Assignment for Critical Resource

CWE-732

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): NONE
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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