#VU50885 Race condition in Firefox for Android - CVE-2021-23977

Vulnerability identifier: #VU50885

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-23977

CWE-ID: CWE-367

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
Firefox for Android
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a malicious application to read sensitive information.

The vulnerability exists due to a race condition. A local application can read sensitive data from Firefox directories.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox for Android: 80.1.2 - 85.1.3

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2021-07/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.