Is CVE-2021-23970 in the CISA KEV catalog?

No. CVE-2021-23970 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23970?

CVE-2021-23970 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-23970?

CVE-2021-23970 has an EPSS score of 1.01% (59th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23970?

Upgrade firefox on debian unstable to 86.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2021-23970

MEDIUM

6.5

CVSS v3

NVD

Description

Context-specific code was included in a shared jump table; resulting in assertions being triggered in multithreaded wasm code. This vulnerability affects Firefox < 86.

CWE-617

How to fix

Remediation Available

firefoxDebian

Fixed in:86.0-1CVE-2021-23970

firefoxUbuntu

Fixed in:86.0+build3-0ubuntu0.16.04.1USN-4756-1

Fixed in:86.0+build3-0ubuntu0.18.04.1USN-4756-1

Fixed in:86.0+build3-0ubuntu0.20.04.1USN-4756-1

DeveloperEditionWindows application

Affected:86.0Fixed in:86.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:86.0Fixed in:86.0Mozilla

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

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.01%probability of exploitation in 30 days

59thpercentile

Moderate risk: more likely to be exploited than 59% of all known CVEs.

References

Vendor Advisory2

Third-Party Advisory1

security.gentoo.org

Related Vulnerabilities

Other CWE-617 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-8617	High	7.5	93%	-	Fix
CVE-2020-36222	High	7.5	78%	-	Fix
CVE-2006-5779	High	7.5	75%	-	Fix
CVE-2021-27212	High	7.5	64%	-	Fix
CVE-2018-5740	High	7.5	59%	-	Fix
CVE-2023-28425	Medium	5.5	55%	-	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.