High 7.5HealthcarePublished Jun 28, 2022

CVE-2021-41689DCMTK through 3.6.6 does not handle string copy properly.

Updated under an hour ago (2026-10-19 07:23 UTC)

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It affects dcmtk and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 1.90%, higher than 79% of scored CVEs.

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Every CVE for dcmtk

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 1.90% (percentile 79)
Assigned by: mitre
NVD analysis: Modified
Record last updated: Nov 3, 2025
First seen by InfoSec Signals: Oct 12, 2026

Affected products

Affected products

dcmtk dcmtk dcmtk:dcmtk	through 3.6.6	CISA ADP
offis dcmtk offis:dcmtk	through 3.6.6	NVD

References

https://github.com/DCMTK/dcmtkproduct, third-party-advisory
https://github.com/DCMTK/dcmtk/commit/5c14bf53fb42ceca12bbcc0016e8704b1580920dpatch, third-party-advisory
https://lists.debian.org/debian-lts-announce/2024/06/msg00022.htmlmailing-list
https://lists.debian.org/debian-lts-announce/2025/01/msg00032.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.