Is CVE-2021-29987 in the CISA KEV catalog?

No. CVE-2021-29987 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-29987?

CVE-2021-29987 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-29987?

CVE-2021-29987 has an EPSS score of 0.95% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-29987?

Upgrade firefox on debian unstable to 91.0-1 or later. Fixes are available for 6 affected products.

CVE & CISA-KEV Catalog

CVE-2021-29987

MEDIUM

6.5

CVSS v3

NVD

Description

After requesting multiple permissions, and closing the first permission panel, subsequent permission panels will be displayed in a different position but still record a click in the default location, making it possible to trick a user into accepting a permission they did not want to. *This bug only affects Firefox on Linux. Other operating systems are unaffected.*. This vulnerability affects Firefox < 91 and Thunderbird < 91.

CWE-307

How to fix

Remediation Available

firefoxDebian

Fixed in:91.0-1CVE-2021-29987

firefoxUbuntu

Fixed in:91.0+build2-0ubuntu0.18.04.1USN-5037-1

Fixed in:91.0+build2-0ubuntu0.20.04.1USN-5037-1

thunderbirdUbuntu

Fixed in:1:91.5.0+build1-0ubuntu0.18.04.1USN-5248-1

Fixed in:1:91.5.0+build1-0ubuntu0.20.04.1USN-5248-1

DeveloperEditionWindows application

Affected:91.0Fixed in:91.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:91.0Fixed in:91.0Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:91.0Fixed in:91.0Mozilla

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

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

0.95%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory1

security.gentoo.org

Related Vulnerabilities

Other CWE-307 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2019-17240	Critical	9.8	40%	-	-
CVE-2023-29301	High	7.5	29%	-	-
CVE-2023-22960	High	7.5	28%	-	Fix
CVE-2020-15906	Critical	9.8	27%	-	Fix
CVE-2016-9361	Critical	9.8	20%	-	-
CVE-2024-39225	Critical	9.8	15%	-	-

Embed a live status badge for CVE-2021-29987

Markdown

[![CVE-2021-29987](https://tridentstack.com/cve/badge/CVE-2021-29987.svg)](https://tridentstack.com/cve/CVE-2021-29987)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-29987"><img src="https://tridentstack.com/cve/badge/CVE-2021-29987.svg" alt="CVE-2021-29987"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.