Is CVE-2021-20308 in the CISA KEV catalog?

No. CVE-2021-20308 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-20308?

CVE-2021-20308 has a CVSS v3 base score of 9.8 (CRITICAL).

What is the EPSS score for CVE-2021-20308?

CVE-2021-20308 has an EPSS score of 2.48% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-20308?

Upgrade htmldoc on debian 11 to 1.9.11-3 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-20308

CRITICALEPSS 83th pctl

9.8

CVSS v3

NVD

Description

Integer overflow in the htmldoc 1.9.11 and before may allow attackers to execute arbitrary code and cause a denial of service that is similar to CVE-2017-9181.

CWE-190Integer Overflow

How to fix

Remediation Available

htmldocDebian

Fixed in:1.9.11-3CVE-2021-20308

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

2.48%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Exploit2

Third-Party Advisory1

lists.debian.org

Related Vulnerabilities

Other CWE-190 (Integer Overflow) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix
CVE-2019-11477	High	7.5	99%	-	Fix
CVE-2023-44443	High	7.8	94%	-	Fix
CVE-2014-0569	High	9.3	90%	-	-
CVE-2017-3599	High	7.5	90%	-	Fix
CVE-2023-21716	Critical	9.8	82%	-	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.