CVE-2021-37181Network attack vector

Unauthenticated remote code execution via unsafe deserialization

Published Sep 14, 2021 · Updated Aug 4, 2024

Deserialization of untrusted data in Siemens Desigo CC allows unauthenticated remote attackers to execute code via CCOM client connections. The CCOM communication component deserializes attacker-controlled data without sufficient validation when serving Windows App or IE XBAP clients. Internet exposure enables direct attack, while systems reachable only on a local network require network access; regular installed and HTML5 Flex clients are not affected.

CVSS severity10.0
Critical
EPSS probability1.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deserialization of untrusted data in Siemens Desigo CC allows unauthenticated remote attackers to execute code via CCOM client connections. The CCOM communication component deserializes attacker-controlled data without sufficient validation when serving Windows App or IE XBAP clients. Internet exposure enables direct attack, while systems reachable only on a local network require network access; regular installed and HTML5 Flex clients are not affected.

The record

CVE
CVE-2021-37181
Published
Sep 14, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Desigo CC
Classifications
CWE-502, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=All versions
  2. Affected versionversion=All versions < V5.0 QU1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · Desigo CCversion=All versions; version=All versions < V5.0 QU1
Siemens · Cerberus DMSversion=All versions; version=All versions < v5.0 QU1
Siemens · Desigo CC Compactversion=All versions; version=All versions < V5.0 QU1

Published CVSS scores

10.0Siemens ProductCERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
7.5NVDAV:N/AC:L/Au:N/C:P/I:P/A: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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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