CVE-2021-23977

low-risk

Published 2021-02-26

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.

Do I need to act?

0.37% chance of exploitation

EPSS score — low exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 5.3/10 Medium

NETWORK / HIGH complexity

Affected Products (1)

Firefox

Affected Vendors

Mozilla

References (6)

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1684761

Third Party Advisory https://security.gentoo.org/glsa/202104-10

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

Issue Tracking https://bugzilla.mozilla.org/show_bug.cgi?id=1684761

Third Party Advisory https://security.gentoo.org/glsa/202104-10

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

/ 100

low-risk

Severity 17/34 · Moderate

Exploitability 1/34 · Minimal

Exposure 5/34 · Minimal