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TI-2026-71582 Aliases CVE-2026-85114

Path traversal in Siemens .NET Client Library for SIMATIC S7 Webserver API

Priority MEDIUM 44CWE-22Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

Siemens .NET Client Library for SIMATIC S7 Webserver API is affected in all versions before V3.3.61. The applications do not properly validate filenames received from remote servers during ticket downloads, which is a path traversal flaw (CWE-22). An attacker who can manipulate the ticket response can write arbitrary files outside the intended download directory and, when overwriting is enabled, replace existing files accessible to the application.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Description from the CNA

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0033 26th percentileScored 2026-11-07
Fix Fixed .NET Client Library for SIMATIC S7 Webserver API (Siemens): V3.3.61

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Siemens.NET Client Library for SIMATIC S7 Webserver APIbefore V3.3.61V3.3.61Patch availableCNA
  • .NET Client Library for SIMATIC S7 Webserver API VendorSiemens Affected before V3.3.61 Fixed in V3.3.61 Patch available CNA

Remediation

Update the .NET Client Library for SIMATIC S7 Webserver API to V3.3.61 or later. CISA has not listed this vulnerability in its Known Exploited Vulnerabilities catalog.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

  • Fix · CNA .NET Client Library for SIMATIC S7 Webserver API (Siemens) Fixed in V3.3.61

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-85114
  2. 2026-10-14 Priority changed: MEDIUM → LOW
  3. 2026-10-18 CISA SSVC decision points changed
  4. 2026-10-18 Priority changed: LOW → MEDIUM

References

Other 1

  • TI-2026-20057 Authentication bypass in Fortinet FortiWeb KEVCVSS 3.1CRITICAL 9.4
  • TI-2025-26358 tls: fix handling of zero-length records on the rx_list KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-18911 Heap-based buffer overflow in Fortinet FortiSwitchManager KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-09686 Type confusion in Google Chrome KEVCVSS 3.1CRITICAL 9.8
  • TI-2022-07142 Code injection in Spring Framework KEVCVSS 3.1CRITICAL 9.8
  • TI-2021-19919 Apache Log4j2 JNDI features do not protect against attacker controlled LDAP and other JNDI related endpoints KEVCVSS 3.1CRITICAL 10.0
See all 2487 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences