Is CVE-2021-23158 in the CISA KEV catalog?

No. CVE-2021-23158 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-23158?

CVE-2021-23158 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-23158?

CVE-2021-23158 has an EPSS score of 2.28% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-23158?

Upgrade htmldoc on debian 11 to 1.9.11-4 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-23158

CRITICALEPSS 81th pctl

9.8

CVSS v3

NVD

Description

A flaw was found in htmldoc in v1.9.12. Double-free in function pspdf_export(),in ps-pdf.cxx may result in a write-what-where condition, allowing an attacker to execute arbitrary code and denial of service.

CWE-415

How to fix

Remediation Available

htmldocDebian

Fixed in:1.9.11-4CVE-2021-23158

htmldocUbuntu

Fixed in:1.8.27-8ubuntu1+esm3USN-7189-1

Fixed in:1.8.27-8ubuntu1.1+esm2USN-7189-1

Fixed in:1.9.2-1ubuntu0.2+esm1USN-7189-1

Fixed in:1.9.7-1ubuntu0.3+esm1USN-7189-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.28%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Third-Party Advisory1

bugzilla.redhat.com

Related Vulnerabilities

Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-25136	Medium	6.5	90%	-	Fix
CVE-2018-0101	Critical	10.0	87%	-	Fix
CVE-2003-0545	Critical	9.8	85%	-	Fix
CVE-2019-3829	Medium	5.3	59%	-	Fix
CVE-2026-33824	Critical	9.8	56%	-	Fix
CVE-2021-3407	Medium	5.5	50%	-	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.