What is CVE-2021-29971?

CVE-2021-29971 is a critical-severity vulnerability in Mozilla Firefox, classified under Improper Preservation of Permissions. CVSS score: 9.8/10. Published 2021-08-05.

How severe is CVE-2021-29971?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Mozilla Firefox

CVE-2021-29971

If a user had granted a permission to a webpage and saved that grant, any webpage running on the same host - irrespective of scheme or port - would be granted that permission. *This bug only affects Firefox for Android. Other operating sys…

EPSS: 0.010 (59.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Mozilla Firefox — versions unspecified

Weakness classification (CWE)

CWE-281 — Improper Preservation of Permissions

References

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

Frequently asked questions

What is CVE-2021-29971?: CVE-2021-29971 is a critical-severity vulnerability in Mozilla Firefox, classified under Improper Preservation of Permissions. CVSS score: 9.8/10. Published 2021-08-05.
How severe is CVE-2021-29971?: Critical severity. CVSS v3 base score is 9.8 out of 10.