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TI-2021-18377 Aliases CVE-2021-41689GHSA-558h-5pv9-xxg9

DCMTK through 3.6.6 does not handle string copy properly.

Priority MEDIUM 43CWE-476Published · 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 · CISA ADP. Fix status from CNA. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01945 80th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

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-2021-41689
  2. 2026-10-03 Alias added: GHSA-558h-5pv9-xxg9

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