Insufficient UI Warning of Dangerous Operations in Mozilla Firefox - CVE-2021-29987
Published: August 10, 2021
Vulnerability identifier: #VU55686
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-29987
CWE-ID: CWE-357
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Mozilla
Affected software:
Mozilla Firefox
Mozilla Firefox
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to the way Firefox displays permission panels. 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.
Note, the vulnerability affects Linux installations only.
How to mitigate CVE-2021-29987
Install updates from vendor's website.