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TI-2021-18375 Aliases CVE-2021-41687GHSA-342m-fmj9-855c

DCMTK through 3.6.6 does not handle memory free properly.

Priority LOW 37CWE-401Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-401.

Summary

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.

Why it matters now

EPSS 0.01838 79th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:offis:dcmtk:*:*:*:*:*:*:*:*up to 3.6.6VulnerableOFFIS
  • cpe:2.3:a:offis:dcmtk:*:*:*:*:*:*:*:* Versions up to 3.6.6 Vulnerable ·OFFIS

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-41687
  2. 2026-10-03 Alias added: GHSA-342m-fmj9-855c

References

Patch 1

Advisory 1

Other 1

  • TI-2025-08922 DCMTK dcm2img diybrpxt.h memory corruption CVSS 4.0MEDIUM 4.8
  • TI-2022-04568 DCMTK dcmqrscp dcmqrcnf.cc readPeerList null pointer dereference CVSS 4.0MEDIUM 4.8
  • TI-2020-18990 DCMTK dcmqrscp parseQuota stack-based overflow CVSS 4.0MEDIUM 4.8
  • TI-2024-22823 dcmnet in DCMTK before 3.6.9 has a segmentation fault via an invalid DIMSE message. CVSS 3.1MEDIUM 4.3
  • TI-2019-16028 Out-of-bounds write in OFFIS.de DCMTK CVSS 3.1CRITICAL 9.8
  • TI-2022-01961 OFFIS DCMTK Path Traversal CVSS 3.1CRITICAL 9.8
See all 23 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences