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Fencer Vulns
high 7.5

CVE-2021-41690 json

DCMTK through 3.6.6 does not handle memory free properly.

published 2022-06-28 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-28702

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.8%
EPSS 1.8% chance of exploitation in 30 days, percentile 79%
public exploits
0
none known

Summary

DCMTK through 3.6.6 does not handle memory free properly. The malloced memory for storing all file information are recorded in a global variable LST and are not freed properly. Sending specific requests to the dcmqrdb program can incur a memory leak. An attacker can use it to launch a DoS attack.

Patch / fix

  • dcmtk Debian 14, Debian 13, Debian 12 3.6.7-1

debian advisories DEBIAN-CVE-2021-41690

  • dcmtk Ubuntu 20.04 LTS 3.6.4-2.1ubuntu0.1
  • dcmtk Ubuntu Pro 16.04 LTS 3.6.1~20150924-5ubuntu0.1~esm1
  • dcmtk Ubuntu Pro 18.04 LTS 3.6.2-3ubuntu0.1~esm1
  • dcmtk Ubuntu Pro 20.04 LTS 3.6.4-2.1ubuntu0.1~esm1
  • dcmtk Ubuntu Pro 22.04 LTS 3.6.6-5ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2021-41690

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-41690 updated cvss 7.5

dcmtk: sending specific requests to the dcmqrdb program can incur a memory leak

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
2 y ago

Exploit prediction

1.84% chance of exploitation in the next 30 days, higher than 79% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-401 Missing Release of Memory after Effective Lifetime

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.