What is CVE-2021-23957?

CVE-2021-23957 is a high-severity vulnerability in Mozilla Firefox. CVSS score: 7.4/10. Published 2021-02-26.

How severe is CVE-2021-23957?

High severity. CVSS v3 base score is 7.4 out of 10.

Vulnerability in Mozilla Firefox

CVE-2021-23957

Navigations through the Android-specific `intent` URL scheme could have been misused to escape iframe sandbox. Note: This issue only affected Firefox for Android. Other operating systems are unaffected. This vulnerability affects Firefox < 85.

EPSS: 0.008 (52.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:H/A:N.

Affected products

Mozilla Firefox — versions < 85

References

security@mozilla.org (x_refsource_MISC, Release Notes, Vendor Advisory)
security@mozilla.org (Permissions Required, x_refsource_MISC, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2021-23957?: CVE-2021-23957 is a high-severity vulnerability in Mozilla Firefox. CVSS score: 7.4/10. Published 2021-02-26.
How severe is CVE-2021-23957?: High severity. CVSS v3 base score is 7.4 out of 10.