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TI-2026-71583 Aliases CVE-2026-85115

Siemens .NET S7 Webserver client logs expose PLC restore passwords

Priority LOW 29CWE-209Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-209.

Summary

All versions of Siemens .NET Client Library for SIMATIC S7 Webserver API before V3.3.62 are affected. Affected applications do not redact PLC restore passwords from HTTP error exception messages (CWE-209). A local attacker with low privileges who can read logs or other diagnostic output can obtain the plaintext restore password and potentially perform unauthorized operations on the PLC.

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 < V3.3.62). 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00109 1st percentileScored 2026-11-07
Fix Fixed .NET Client Library for SIMATIC S7 Webserver API (Siemens): V3.3.62

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
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 V3.3.62V3.3.62Patch availableCNA
  • .NET Client Library for SIMATIC S7 Webserver API VendorSiemens Affected before V3.3.62 Fixed in V3.3.62 Patch available CNA

Remediation

Update the .NET Client Library for SIMATIC S7 Webserver API to V3.3.62. No advisory identifier is listed for this fix.

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 V3.3.62

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-85115
  2. 2026-10-14 CISA SSVC decision points changed
  3. 2026-10-14 Priority changed: MEDIUM → LOW

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