CVE-2021-23975

MEDIUM

Firefox < 86.0 - Missing Authorization in about:memory Measure Function

Title source: llm

Description

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.

References (3)

Core 3

Core References

Release Notes, Vendor Advisory x_refsource_misc

https://www.mozilla.org/security/advisories/mfsa2021-07/

Issue Tracking, Permissions Required, Vendor Advisory x_refsource_misc

https://bugzilla.mozilla.org/show_bug.cgi?id=1685145

Third Party Advisory vendor-advisory x_refsource_gentoo

https://security.gentoo.org/glsa/202104-10

Scores

CVSS v3 6.5

EPSS 0.0029

EPSS Percentile 52.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Details

CWE

CWE-862

Status published

Products (1)

mozilla/firefox < 86.0

Published Feb 26, 2021

Tracked Since Feb 18, 2026