CVE-2021-23963

MEDIUM 4.3CVE-2021-23963 · Published 26/02/2021 · updated 17/06/2026

In short

CVE-2021-23963 is a MEDIUM (CVSS 4.3) vulnerability affecting firefox (mozilla).
Chance of exploitation in the next 30 days (EPSS): 0.66%, higher than 51.6% of all vulnerabilities.
Fix: update to 85.0 or later.

Package	Affected versions	Patched versions
firefox mozilla	`< 85.0`	`85.0`

Description

When sharing geolocation during an active WebRTC share, Firefox could have reset the webRTC sharing state in the user interface, leading to loss of control over the currently granted permission. This vulnerability affects Firefox < 85.

References

bugzilla.mozilla.org/show_bug.cgi · Issue Tracking
mozilla.org/security/advisories/mfsa2021-03 · Release Notes

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Package

Affected versions

Patched versions

firefox

mozilla

< 85.0

85.0

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