A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61). Affected applications do not properly validate filenames received from remote servers during ticket downloads.

This could allow an attacker who can manipulate the ticket response to write arbitrary files outside the intended download directory and, when overwriting is enabled, replace existing files accessible to the application.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact None

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Siemens .NET Client Library for SIMATIC S7 Webserver API unknown
Version Status Constraints
0 affected < V3.3.61

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Project Subscriptions

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Advisories

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://cert-portal.siemens.com/productcert/html/ssa-390352.html cve-icon cve-icon
History

Tue, 13 Oct 2026 11:45:00 +0000

Type Values Removed Values Added
Title Unvalidated Ticket Response Allows Arbitrary File Write in Siemens .NET Client Library

Tue, 13 Oct 2026 09:45:00 +0000

Type Values Removed Values Added
Description A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.61). Affected applications do not properly validate filenames received from remote servers during ticket downloads. This could allow an attacker who can manipulate the ticket response to write arbitrary files outside the intended download directory and, when overwriting is enabled, replace existing files accessible to the application.
Weaknesses CWE-22
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'}

cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: siemens

Published:

Updated: 2026-10-13T09:18:57.499Z

Reserved: 2026-09-03T07:46:11.019Z

Link: CVE-2026-85114

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-13T10:17:20.640

Modified: 2026-10-13T10:17:20.640

Link: CVE-2026-85114

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-13T11:30:04Z

Weaknesses