What’s Vulnerable › Vulnerabilities

CVE-2021-24000

• Severity: low (CVSS 3.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-24 · updated 2026-06-17
• Weakness: CWE-362

Description

A race condition with requestPointerLock() and setTimeout() could have resulted in a user interacting with one tab when they believed they were on a separate tab. In conjunction with certain elements (such as &lt;input type="file"&gt;) this could have led to an attack where a user was confused about the origin of the webpage and potentially disclosed information they did not intend to. This vulnerability affects Firefox < 88.

Affected products

• Mozilla Firefox: before 88.0 — fixed in 88.0

How to fix

Upgrade to a fixed version: Mozilla Firefox 88.0. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1694698
• https://www.mozilla.org/security/advisories/mfsa2021-16/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1694698
• https://www.mozilla.org/security/advisories/mfsa2021-16/

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