Is CVE-2021-41689 in the CISA KEV catalog?

No. CVE-2021-41689 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-41689?

CVE-2021-41689 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-41689?

CVE-2021-41689 has an EPSS score of 1.69% (74th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-41689?

Upgrade dcmtk on debian 11 to 3.6.5-1+deb11u1 or later. Fixes are available for 8 affected products.

CVE & CISA-KEV Catalog

CVE-2021-41689

HIGHEPSS 74th pctl

7.5

CVSS v3

NVD

Description

DCMTK through 3.6.6 does not handle string copy properly. Sending specific requests to the dcmqrdb program, it would query its database and copy the result even if the result is null, which can incur a head-based overflow. An attacker can use it to launch a DoS attack.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

dcmtkDebian

Fixed in:3.6.5-1+deb11u1CVE-2021-41689

Fixed in:3.6.7-1CVE-2021-41689

dcmtkUbuntu

Fixed in:3.6.1~20150924-5ubuntu0.1~esm1USN-5882-1

Fixed in:3.6.1~20150924-5ubuntu0.1~esm2USN-7010-1

Fixed in:3.6.2-3ubuntu0.1~esm2USN-7010-1

Fixed in:3.6.2-3ubuntu0.1~esm1USN-5882-1

Fixed in:3.6.4-2.1ubuntu0.1USN-7010-1

Fixed in:3.6.4-2.1ubuntu0.1~esm1USN-5882-1

Fixed in:3.6.6-5ubuntu0.1~esm2USN-7010-1

Fixed in:3.6.6-5ubuntu0.1~esm1USN-5882-1

Fixed in:3.6.7-6ubuntu0.1USN-5882-1

Fixed in:3.6.7-9.1ubuntu0.1~esm1USN-7010-1

libdcmtk12Ubuntu

Fixed in:3.6.2-3ubuntu0.1~esm1USN-5882-1

Fixed in:3.6.2-3ubuntu0.1~esm2USN-7010-1

libdcmtk14Ubuntu

Fixed in:3.6.4-2.1ubuntu0.1USN-7010-1

Fixed in:3.6.4-2.1ubuntu0.1~esm1USN-5882-1

libdcmtk16Ubuntu

Fixed in:3.6.6-5ubuntu0.1~esm2USN-7010-1

Fixed in:3.6.6-5ubuntu0.1~esm1USN-5882-1

libdcmtk17Ubuntu

Fixed in:3.6.7-6ubuntu0.1USN-5882-1

libdcmtk17t64Ubuntu

Fixed in:3.6.7-9.1ubuntu0.1~esm1USN-7010-1

libdcmtk5Ubuntu

Fixed in:3.6.1~20150924-5ubuntu0.1~esm2USN-7010-1

Fixed in:3.6.1~20150924-5ubuntu0.1~esm1USN-5882-1

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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.69%probability of exploitation in 30 days

74thpercentile

Elevated risk: more likely to be exploited than 74% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

github.com

Other references2

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 2025-11-03.