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CVE-2021-23954

Date: February 25, 2021

Using the new logical assignment operators in a JavaScript switch statement could have caused a type confusion, leading to a memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

Severity Score

Related Resources (10)

https://www.mozilla.org/security/advisories/mfsa2021-04/
https://security-tracker.debian.org/tracker/CVE-2021-23954
https://www.mozilla.org/security/advisories/mfsa2021-03/
https://www.mozilla.org/security/advisories/mfsa2021-05/
https://bugzilla.mozilla.org/show_bug.cgi?id=1684020
https://access.redhat.com/security/cve/CVE-2021-23954
https://security.alpinelinux.org/vuln/CVE-2021-23954
https://nvd.nist.gov/vuln/detail/CVE-2021-23954
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-23954
https://www.mend.io/vulnerability-database/CVE-2021-23954

Severity Score

Weakness Type (CWE)

Access of Resource Using Incompatible Type ('Type Confusion')

CWE-843

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): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

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

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