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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Siemens | .NET Client Library for SIMATIC S7 Webserver API | < V3.3.61 | V3.3.61 |
Advisories 4
- SSA-390352 SSA-390352: Multiple Vulnerabilities in .NET Client Library for SIMATIC S7 Webserver API Siemens ProductCERT · Nov 10, 2026
- ICSA-26-295-10 Siemens SIMATIC S7 Webserver API CISA ICS & IT advisories · Oct 22, 2026
- WID-SEC-2026-3891 Siemens SIMATIC S7: Mehrere Schwachstelle BSI CERT-Bund (WID) · Oct 18, 2026
- NCSC-2026-0415 Kwetsbaarheden verholpen in Siemens-producten NCSC-NL (Netherlands) · Oct 13, 2026