#VU52339 Race condition in Mozilla Firefox

Published: 2021-04-19

Vulnerability identifier: #VU52339

Vulnerability risk: Medium


CVE-ID: CVE-2021-24000


Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Mozilla Firefox
Client/Desktop applications / Web browsers

Vendor: Mozilla


The vulnerability allows a remote attacker to perform clickjacking attack.

The vulnerability exists due to a race condition within requestPointerLock() and setTimeout() methods in conjunctions with certain elements, such as <input type="file">. A remote attacker can create a specially crafted web page that will result in a situation where a user interacting with one tab when they believed they were on a separate tab and gain access to sensitive information.

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Vulnerable software versions

Mozilla Firefox: 80.0 - 87.0


External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?

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