Is CVE-2021-41687 in the CISA KEV catalog?

No. CVE-2021-41687 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-41687?

CVE-2021-41687 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-41687?

CVE-2021-41687 has an EPSS score of 1.59% (73th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-41687?

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-2021-41687

HIGHEPSS 73th pctl

7.5

CVSS v3

NVD

Description

DCMTK through 3.6.6 does not handle memory free properly. The program malloc a heap memory for parsing data, but does not free it when error in parsing. Sending specific requests to the dcmqrdb program incur the memory leak. An attacker can use it to launch a DoS attack.

CWE-401Missing Release of Memory (Memory Leak)

How to fix

Remediation Available

dcmtkDebian

Fixed in:3.6.5-1+deb11u1CVE-2021-41687

Fixed in:3.6.7-1CVE-2021-41687

dcmtkUbuntu

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

Fixed in:3.6.1~20150924-5ubuntu0.1~esm3USN-7010-2

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

Fixed in:3.6.2-3ubuntu0.1~esm3USN-7010-2

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

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

Fixed in:3.6.4-2.1ubuntu0.2USN-7010-2

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

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

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

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

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~esm3USN-7010-2

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

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

libdcmtk14Ubuntu

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

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

Fixed in:3.6.4-2.1ubuntu0.2USN-7010-2

libdcmtk16Ubuntu

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

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

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~esm3USN-7010-2

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

1.59%probability of exploitation in 30 days

73rdpercentile

Elevated risk: more likely to be exploited than 73% of all known CVEs.

References

Patch1

github.com

Third-Party Advisory1

github.com

Other references2

Related Vulnerabilities

Other CWE-401 (Missing Release of Memory (Memory Leak)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-13934	High	7.5	64%	-	Fix
CVE-2016-6304	High	7.5	63%	-	Fix
CVE-2019-12265	Medium	5.3	55%	-	Fix
CVE-2001-0136	Medium	5.0	45%	-	-
CVE-2016-4232	High	7.5	36%	-	-
CVE-2001-0543	Medium	5.0	21%	-	-

Embed a live status badge for CVE-2021-41687

Markdown

[![CVE-2021-41687](https://tridentstack.com/cve/badge/CVE-2021-41687.svg)](https://tridentstack.com/cve/CVE-2021-41687)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-41687"><img src="https://tridentstack.com/cve/badge/CVE-2021-41687.svg" alt="CVE-2021-41687"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

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.