Is CVE-2021-23975 in the CISA KEV catalog?

No. CVE-2021-23975 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23975?

CVE-2021-23975 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2021-23975?

CVE-2021-23975 has an EPSS score of 1.02% (59th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23975?

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

CVE & CISA-KEV Catalog

CVE-2021-23975

MEDIUM

6.5

CVSS v3

NVD

Description

The developer page about:memory has a Measure function for exploring what object types the browser has allocated and their sizes. When this function was invoked we incorrectly called the sizeof function, instead of using the API method that checks for invalid pointers. This vulnerability affects Firefox < 86.

CWE-862Missing Authorization

How to fix

Remediation Available

firefoxDebian

Fixed in:86.0-1CVE-2021-23975

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

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.02%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-862 (Missing Authorization) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2021-39226	Critical	9.8	100%	KEV	Fix
CVE-2022-0543	Critical	10.0	100%	KEV	Fix
CVE-2021-21978	Critical	9.8	99%	-	Fix
CVE-2023-52163	High	8.8	96%	KEV	-
CVE-2022-1329	High	8.8	93%	-	-
CVE-2023-6875	Critical	9.8	90%	-	-

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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.