CVE-2021-41687DCMTK through 3.6.6 does not handle memory free properly.
Updated under an hour ago ()
Does this affect you?
It affects offis dcmtk. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 1.79%, higher than 78% of scored CVEs.
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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.
- CVSS
- 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 1.79% (percentile 78)
- Assigned by
- mitre
- NVD analysis
- Modified
- Record last updated
- Nov 3, 2025
- First seen by InfoSec Signals
- Oct 12, 2026
Affected products
offis dcmtk offis:dcmtk | through 3.6.6 | NVD |
References
- https://github.com/DCMTK/dcmtkproduct, third-party-advisory
- https://github.com/DCMTK/dcmtk/commit/a9697dfeb672b0b9412c00c7d36d801e27ec85cbpatch, 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.