Is CVE-2021-29959 in the CISA KEV catalog?

No. CVE-2021-29959 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29959?

CVE-2021-29959 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2021-29959?

CVE-2021-29959 has an EPSS score of 0.84% (53th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29959?

Upgrade firefox on debian unstable to 89.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29959

MEDIUM

4.3

CVSS v3

NVD

Description

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.

CWE-863Incorrect Authorization

How to fix

Remediation Available

firefoxDebian

Fixed in:89.0-1CVE-2021-29959

firefoxUbuntu

Fixed in:89.0+build2-0ubuntu0.18.04.2USN-4978-1

Fixed in:89.0+build2-0ubuntu0.20.04.2USN-4978-1

DeveloperEditionWindows application

Affected:78.11.0 89.0Fixed in:89.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:78.11.0 89.0Fixed in:89.0Mozilla

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.84%probability of exploitation in 30 days

53rdpercentile

Moderate risk: more likely to be exploited than 53% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory1

security.gentoo.org

Related Vulnerabilities

Other CWE-863 (Incorrect Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-22518	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2023-38035	Critical	9.8	100%	KEV + Ransom	-
CVE-2022-46169	Critical	9.8	100%	KEV	Fix
CVE-2025-29927	Critical	9.1	100%	-	Fix
CVE-2024-38856	Critical	9.8	99%	KEV	Fix
CVE-2020-36289	Medium	5.3	99%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.