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CVE-2021-23977

Date: February 25, 2021

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.

Severity Score

Related Resources (6)

https://bugzilla.mozilla.org/show_bug.cgi?id=1684761
https://www.mozilla.org/security/advisories/mfsa2021-07/
https://security.gentoo.org/glsa/202104-10
https://security.alpinelinux.org/vuln/CVE-2021-23977
https://nvd.nist.gov/vuln/detail/CVE-2021-23977
https://www.mend.io/vulnerability-database/CVE-2021-23977

Severity Score

Weakness Type (CWE)

Time-of-check Time-of-use (TOCTOU) Race Condition

CWE-367

CVSS v3.1

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

CVSS v2

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

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