CVE-2021-42025Network attack vector

Authenticated file-content manipulation via unchecked client actions

Published Nov 9, 2021 · Updated Aug 4, 2024

Incorrect authorization in Siemens Mendix 8 before 8.18.13 and Mendix 9 before 9.6.2 allows remote authenticated users to alter file contents. Certain client actions write System.FileDocument content without enforcing the application's configured write access. A valid application account and a reachable affected action are required; exploitation changes stored file data but does not disclose data or interrupt service.

CVSS severity6.5
Medium
EPSS probability0.58%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Siemens Mendix 8 before 8.18.13 and Mendix 9 before 9.6.2 allows remote authenticated users to alter file contents. Certain client actions write System.FileDocument content without enforcing the application's configured write access. A valid application account and a reachable affected action are required; exploitation changes stored file data but does not disclose data or interrupt service.

The record

CVE
CVE-2021-42025
Published
Nov 9, 2021
Updated
Aug 4, 2024
Vendor
Siemens
Product
Mendix
Classifications
CWE-863, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 9, 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 < V8.18.13
  2. Affected versionversion=All versions < V9.6.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Siemens · Mendixversion=All versions < V8.18.13; version=All versions < V9.6.2

Published CVSS scores

6.8NIST NVDAV:N/AC:L/Au:S/C:N/I:C/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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-863Incorrect Authorization
T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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