Is CVE-2021-23994 in the CISA KEV catalog?

No. CVE-2021-23994 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23994?

CVE-2021-23994 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-23994?

CVE-2021-23994 has an EPSS score of 1.76% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23994?

Upgrade firefox on debian unstable to 88.0-1 or later. Fixes are available for 7 affected products.

CVE & CISA-KEV Catalog

CVE-2021-23994

HIGHEPSS 76th pctl

8.8

CVSS v3

NVD

Description

A WebGL framebuffer was not initialized early enough, resulting in memory corruption and an out of bound write. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.

CWE-909

How to fix

Remediation Available

firefoxDebian

Fixed in:88.0-1CVE-2021-23994

firefoxUbuntu

Fixed in:88.0+build2-0ubuntu0.16.04.1USN-4926-1

Fixed in:88.0+build2-0ubuntu0.18.04.2USN-4926-1

Fixed in:88.0+build2-0ubuntu0.20.04.1USN-4926-1

thunderbirdUbuntu

Fixed in:1:78.11.0+build1-0ubuntu0.18.04.2USN-4995-2

Fixed in:1:78.11.0+build1-0ubuntu0.20.04.2USN-4995-1

DeveloperEditionWindows application

Affected:88.0Fixed in:88.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:88.0Fixed in:88.0Mozilla

Mozilla Firefox ESR (en-US)Windows application

Affected:78.10Fixed in:78.10Mozilla

Mozilla Thunderbird (en-US)Windows application

Affected:78.10Fixed in:78.10Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.76%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Vendor Advisory4

Related Vulnerabilities

Other CWE-909 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2018-14647	High	7.5	11%	-	Fix
CVE-2019-9639	High	7.5	8.2%	-	Fix
CVE-2018-10811	High	7.5	7.1%	-	Fix
CVE-2020-12352	Medium	6.5	5.7%	-	Fix
CVE-2019-3804	High	7.5	4.9%	-	Fix
CVE-2020-16932	High	7.8	4.8%	-	-

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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.