Siemens .NET Client Library for SIMATIC S7 Webserver API up to 3.3.61 missing encryption

Summaryinfo

A vulnerability was found in Siemens .NET Client Library for SIMATIC S7 Webserver API up to 3.3.61 and classified as problematic. Affected is an unknown function. Executing a manipulation can lead to missing encryption. This vulnerability is handled as CVE-2026-85115. The attack can be executed remotely. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Siemens .NET Client Library for SIMATIC S7 Webserver API up to 3.3.61. It has been declared as problematic. This vulnerability affects an unknown code. The manipulation with an unknown input leads to a missing encryption vulnerability. The CWE definition for the vulnerability is CWE-311. The product does not encrypt sensitive or critical information before storage or transmission. As an impact it is known to affect confidentiality. CVE summarizes:

A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions < V3.3.62). Affected applications do not properly redact PLC restore passwords from HTTP error exception messages. This could allow an attacker with access to logs or other diagnostic output to obtain the plaintext restore password and potentially perform unauthorized operations on the PLC.

The advisory is available at cert-portal.siemens.com. This vulnerability was named CVE-2026-85115 since 09/03/2026. The exploitation appears to be difficult. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 10/13/2026). This vulnerability is assigned to T1600 by the MITRE ATT&CK project.

Upgrading to version 3.3.62 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
• 3.3.61

License

• commercial

Website

• Vendor: https://www.siemens.com/

CPE 2.3info

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