Siemens .NET Client Library for Simatic S7 Webserver Api up to 3.3.60 path traversal

Summaryinfo

A vulnerability was found in Siemens .NET Client Library for Simatic S7 Webserver Api up to 3.3.60. It has been classified as problematic. Affected by this vulnerability is an unknown functionality. The manipulation leads to path traversal. This vulnerability is uniquely identified as CVE-2026-85114. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Siemens .NET Client Library for Simatic S7 Webserver Api up to 3.3.60. It has been rated as problematic. This issue affects an unknown code block. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at cert-portal.siemens.com. The identification of this vulnerability is CVE-2026-85114 since 09/03/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/13/2026). The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 3.3.61 eliminates this vulnerability.

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Productinfo

Type

• Web Server

Vendor

• Siemens

Name

• .NET Client Library for Simatic S7 Webserver Api

Version

• 3.3.0
• 3.3.1
• 3.3.2
• 3.3.3
• 3.3.4
• 3.3.5
• 3.3.6
• 3.3.7
• 3.3.8
• 3.3.9
• 3.3.10
• 3.3.11
• 3.3.12
• 3.3.13
• 3.3.14
• 3.3.15
• 3.3.16
• 3.3.17
• 3.3.18
• 3.3.19
• 3.3.20
• 3.3.21
• 3.3.22
• 3.3.23
• 3.3.24
• 3.3.25
• 3.3.26
• 3.3.27
• 3.3.28
• 3.3.29
• 3.3.30
• 3.3.31
• 3.3.32
• 3.3.33
• 3.3.34
• 3.3.35
• 3.3.36
• 3.3.37
• 3.3.38
• 3.3.39
• 3.3.40
• 3.3.41
• 3.3.42
• 3.3.43
• 3.3.44
• 3.3.45
• 3.3.46
• 3.3.47
• 3.3.48
• 3.3.49
• 3.3.50
• 3.3.51
• 3.3.52
• 3.3.53
• 3.3.54
• 3.3.55
• 3.3.56
• 3.3.57
• 3.3.58
• 3.3.59
• 3.3.60

License

• commercial

Website

• Vendor: https://www.siemens.com/

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