CVE-2021-37195Network attack vector

Stored script execution via task attachments

Published Jan 11, 2022 · Updated Aug 4, 2024

Stored XSS 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 execute script. The Web component accepts arbitrary code as a task attachment without neutralizing script-related markup and executes it when the attachment loads. Access sufficient to attach code is required, and the resulting script runs in the attachment viewer's browser context with no reported availability impact.

CVSS severity6.1
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS 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 execute script. The Web component accepts arbitrary code as a task attachment without neutralizing script-related markup and executes it when the attachment loads. Access sufficient to attach code is required, and the resulting script runs in the attachment viewer's browser context with no reported availability impact.

The record

CVE
CVE-2021-37195
Published
Jan 11, 2022
Updated
Aug 4, 2024
Vendor
Siemens
Product
COMOS
Classifications
CWE-79, CWE-80, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 11, 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

2.6NIST NVDAV:N/AC:H/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1059.007JavaScript/JScript

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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