Is CVE-2021-23180 in the CISA KEV catalog?

No. CVE-2021-23180 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23180?

CVE-2021-23180 has a CVSS v3 base score of 7.8 (HIGH).

What is the EPSS score for CVE-2021-23180?

CVE-2021-23180 has an EPSS score of 1.27% (66th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23180?

Upgrade htmldoc on debian 11 to 1.9.11-4 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-23180

HIGH

7.8

CVSS v3

NVD

Description

A flaw was found in htmldoc in v1.9.12 and before. Null pointer dereference in file_extension(),in file.c may lead to execute arbitrary code and denial of service.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

htmldocDebian

Fixed in:1.9.11-4CVE-2021-23180

htmldocUbuntu

Fixed in:1.9.7-1ubuntu0.2USN-5198-1

htmldoc-commonUbuntu

Fixed in:1.9.7-1ubuntu0.2USN-5198-1

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 VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

1.27%probability of exploitation in 30 days

66thpercentile

Moderate risk: more likely to be exploited than 66% of all known CVEs.

References

Patch2

Exploit1

github.com

Third-Party Advisory1

ubuntu.com

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	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.