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CVE-2021-23975

Date: February 25, 2021

The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86.

Severity Score

Related Resources (7)

https://www.mozilla.org/security/advisories/mfsa2021-07/
https://bugzilla.mozilla.org/show_bug.cgi?id=1685145
https://nvd.nist.gov/vuln/detail/CVE-2021-23975
https://security.gentoo.org/glsa/202104-10
https://security.alpinelinux.org/vuln/CVE-2021-23975
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-23975
https://www.mend.io/vulnerability-database/CVE-2021-23975

Severity Score

Weakness Type (CWE)

Missing Authorization

CWE-862

CVSS v3

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

CVSS v2

Base Score:
Access Vector (AV):
Access Complexity (AC):
Authentication (AU):
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH
Additional information:

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