---
id: CVE-2026-85114
title: >-
  A vulnerability has been identified in .NET Client Library for SIMATIC S7
  Webserver API (All versions < V3.3.61)
summary: "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.\r\n\r\nThis coul…"
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cwe:
  - CWE-22
vendor: Siemens
product: .NET Client Library for SIMATIC S7 Webserver API
affected:
  - .net_client_library_for_simatic_s7_webserver_api < V3.3.61
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T22:18:24.570'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85114'
references:
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-390352.html'
    label: productcert@siemens.com
tags:
  - nvd
  - cve.org
epss: 0.0033
epssPercentile: 0.26001
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T21:41:14.242299Z'
ingestedAt: '2026-10-13T10:22:03.570Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.