CVE-2021-37194Network attack vector

Arbitrary file write via unrestricted web upload

Published Feb 9, 2022 · Updated Aug 4, 2024

Unrestricted file upload in Siemens COMOS Web 10.2, 10.3 before 10.3.3.3, and 10.4 before 10.4.1 allows remote authenticated users to store files. The upload handler accepts and writes arbitrary file types to the web server without enforcing an allowed-type list. A valid low-privilege account and enabled web components are required; exploitation writes attacker-chosen content, but no code execution is established.

CVSS severity7.5
High
EPSS probability0.85%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Siemens COMOS Web 10.2, 10.3 before 10.3.3.3, and 10.4 before 10.4.1 allows remote authenticated users to store files. The upload handler accepts and writes arbitrary file types to the web server without enforcing an allowed-type list. A valid low-privilege account and enabled web components are required; exploitation writes attacker-chosen content, but no code execution is established.

The record

CVE
CVE-2021-37194
Published
Feb 9, 2022
Updated
Aug 4, 2024
Vendor
Siemens
Product
COMOS
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 9, 2022CVE 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 only if web components are used
  2. Affected versionversion=All versions < V10.3.3.3 only if web components are used
  3. Affected versionversion=All versions < V10.4.1 only if web components are used

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · COMOSversion=All versions only if web components are used; version=All versions < V10.3.3.3 only if web components are used; version=All versions < V10.4.1 only if web components are used

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:P/A:N
7.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
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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