CVE-2020-36855Public exploit

Local service crash via unbounded StorageQuota parsing

Published Oct 21, 2025 · Updated Oct 21, 2025

Stack-based buffer overflow in OFFIS DCMTK dcmqrscp 3.6.0 through 3.6.5 allows local users to crash the service via StorageQuota. The parseQuota function passes the configuration value to sscanf with an unbounded %s conversion into a 512-byte stack buffer. Exploitation requires the ability to supply or modify the local dcmqrscp configuration, and only interruption of the image-archive service is established.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in OFFIS DCMTK dcmqrscp 3.6.0 through 3.6.5 allows local users to crash the service via StorageQuota. The parseQuota function passes the configuration value to sscanf with an unbounded %s conversion into a 512-byte stack buffer. Exploitation requires the ability to supply or modify the local dcmqrscp configuration, and only interruption of the image-archive service is established.

The record

CVE
CVE-2020-36855
Published
Oct 21, 2025
Updated
Oct 21, 2025
Vendor
OFFIS e.V.
Product
DCMTK
Classifications
CWE-121, CWE-119, T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.6.0
  2. Affected versionversion=3.6.1
  3. Affected versionversion=3.6.2
  4. Affected versionversion=3.6.3
  5. Affected versionversion=3.6.4
  6. Affected versionversion=3.6.5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

OFFIS e.V. · DCMTKversion=3.6.0; version=3.6.1; version=3.6.2; version=3.6.3; version=3.6.4; version=3.6.5

Published CVSS scores

4.3VulDBAV:L/AC:L/Au:S/C:P/I:P/A:P
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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