Is CVE-2023-6866 in the CISA KEV catalog?

No. CVE-2023-6866 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-6866?

CVE-2023-6866 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2023-6866?

CVE-2023-6866 has an EPSS score of 0.68% (48th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-6866?

Upgrade firefox on debian unstable to 121.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2023-6866

HIGH

8.8

CVSS v3

NVD

Description

TypedArrays can be fallible and lacked proper exception handling. This could lead to abuse in other APIs which expect TypedArrays to always succeed. This vulnerability affects Firefox < 121.

CWE-755

How to fix

Remediation Available

firefoxDebian

Fixed in:121.0-1CVE-2023-6866

firefoxUbuntu

Fixed in:121.0+build1-0ubuntu0.20.04.1USN-6562-1

DeveloperEditionWindows application

Affected:121.0Fixed in:121.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:121.0Fixed in:121.0Mozilla

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

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.68%probability of exploitation in 30 days

48thpercentile

Moderate risk: more likely to be exploited than 48% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory1

security.gentoo.org

Issue Tracking1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-755 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-5638	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-7247	Critical	9.8	99%	KEV	Fix
CVE-2023-36933	High	7.5	72%	-	Fix
CVE-2018-0934	High	7.5	66%	-	Fix
CVE-2019-14287	High	8.8	64%	-	Fix
CVE-2019-12815	Critical	9.8	58%	-	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.