CVE-2021-29959

4.3 mediumEPSS 0.8%

Medium (4.3) in mozilla firefox. EPSS 0.8% chance of exploitation in the next 30 days.

When a user has already allowed a website to access microphone and camera, disabling camera sharing would not fully prevent the website from re-enabling it without an additional prompt. This was only possible if the website kept recording with the microphone until re-enabling the camera. This vulnerability affects Firefox < 89.

Severity

CVSS 3.1

4.3 medium

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 57% of CVEs (scores of 2026-10-31)
CWE: CWE-863
Published: 2021-06-24
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:firefox

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1395819
https://security.gentoo.org/glsa/202107-09
https://www.mozilla.org/security/advisories/mfsa2021-23/
https://bugzilla.mozilla.org/show_bug.cgi?id=1395819
https://security.gentoo.org/glsa/202107-09

Check your stack JSON