What is CVE-2021-29987?

CVE-2021-29987 is a medium-severity vulnerability in Linux Kernel, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 6.5/10. Published 2021-08-17.

How severe is CVE-2021-29987?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Linux Kernel

CVE-2021-29987

After requesting multiple permissions, and closing the first permission panel, subsequent permission panels will be displayed in a different position but still record a click in the default location, making it possible to trick a user into accepting a permission they did not want to. *This bug only affects Firefox on Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox < 91 and Thunderbird < 91.

EPSS: 0.009 (57.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

Affected products

Linux Linux_kernel
Mozilla Firefox — versions unspecified
Mozilla Thunderbird — versions unspecified

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

security@mozilla.org (x_refsource_MISC, Vendor Advisory)
security@mozilla.org (x_refsource_MISC, Vendor Advisory)
security@mozilla.org (x_refsource_MISC, Issue Tracking, Vendor Advisory)
security@mozilla.org (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)

Frequently asked questions

What is CVE-2021-29987?: CVE-2021-29987 is a medium-severity vulnerability in Linux Kernel, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 6.5/10. Published 2021-08-17.
How severe is CVE-2021-29987?: Medium severity. CVSS v3 base score is 6.5 out of 10.