CVE-2021-23977

MEDIUM

Firefox for Android < 86.0 - Time-of-check Time-of-use Race Condition

Title source: llm

Description

Firefox for Android suffered from a time-of-check-time-of-use vulnerability that allowed a malicious application to read sensitive data from application directories. Note: This issue is only affected Firefox for Android. Other operating systems are unaffected. 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=1684761

Third Party Advisory vendor-advisory x_refsource_gentoo

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

Scores

CVSS v3 5.3

EPSS 0.0037

EPSS Percentile 59.1%

Attack Vector NETWORK

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

Details

CWE

CWE-367

Status published

Products (1)

mozilla/firefox < 86.0

Published Feb 26, 2021

Tracked Since Feb 18, 2026