SSA-970803

Vulnerability from csaf_siemens - Published: 2026-11-10 00:00 - Updated: 2026-11-10 00:00
Summary
SSA-970803: Insecure User Authentication in SIMATIC SCADA and PCS 7 systems
Notes
Summary: The products listed below contain an authentication bypass vulnerability that could allow an on-path attacker to take over the session of a legitimate user and execute arbitrary code with the privileges of the victim user. Siemens is preparing fixes and recommends specific mitigations for products where fixes are not or not yet available.
General Recommendations: As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens' operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals. Additional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity
Additional Resources: For further inquiries on security vulnerabilities in Siemens products and solutions, please contact the Siemens ProductCERT: https://www.siemens.com/cert/advisories
Terms of Use: The use of Siemens Security Advisories is subject to the terms and conditions listed on: https://www.siemens.com/productcert/terms-of-use.
CVE-2026-58114

Affected systems do not properly secure their remote user authentication with the deprecated NTLM protocol. This could allow unauthenticated remote attackers, who have achieved a machine in the middle position, to relay NTLM authentication and impersonate a legitimate user. The potential impact depends on the services that are accessible, e.g. a SQL server used by WinCC.

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE-1390 - Weak Authentication
Affected products
Product Identifier Version Remediation
SIMATIC BATCH V9.1
Siemens / SIMATIC BATCH V9.1
 vers:all/*
Mitigation
No Fix Planned
SIMATIC WinCC Runtime Professional V20
Siemens / SIMATIC WinCC Runtime Professional V20
 vers:all/*
Mitigation
None Available
SIMATIC WinCC Runtime Professional V21
Siemens / SIMATIC WinCC Runtime Professional V21
 vers:all/*
Mitigation
None Available
SIMATIC WinCC V7.5
Siemens / SIMATIC WinCC V7.5
 vers:all/*
Mitigation
None Available
SIMATIC WinCC V8.0
Siemens / SIMATIC WinCC V8.0
 vers:all/*
Mitigation
None Available
SIMATIC WinCC V8.1
Siemens / SIMATIC WinCC V8.1
 vers:all/*
Mitigation
None Available
SIMATIC Information Server 2020
Siemens / SIMATIC Information Server 2020
 vers:all/*
Mitigation
No Fix Planned
SIMATIC Information Server 2022
Siemens / SIMATIC Information Server 2022
 vers:all/*
Mitigation
No Fix Planned
SIMATIC PCS 7 V9.1
Siemens / SIMATIC PCS 7 V9.1
 vers:all/*
Mitigation
No Fix Planned
SIMATIC Process Historian 2020
Siemens / SIMATIC Process Historian 2020
 vers:all/*
Mitigation
No Fix Planned
SIMATIC Process Historian 2022
Siemens / SIMATIC Process Historian 2022
 vers:all/*
Mitigation
No Fix Planned
SIMATIC WinCC Runtime Professional V17
Siemens / SIMATIC WinCC Runtime Professional V17
 vers:all/*
Mitigation
None Available
SIMATIC WinCC Runtime Professional V18
Siemens / SIMATIC WinCC Runtime Professional V18
 vers:all/*
Mitigation
None Available
SIMATIC WinCC Runtime Professional V19
Siemens / SIMATIC WinCC Runtime Professional V19
 vers:all/*
Mitigation
None Available
References
To clipboard 

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      {
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        "text": "The products listed below contain an authentication bypass vulnerability that could allow an on-path attacker to take over the session of a legitimate user and execute arbitrary code with the privileges of the victim user.\n\nSiemens is preparing fixes and recommends specific mitigations for products where fixes are not or not yet available.",
        "title": "Summary"
      },
      {
        "category": "general",
        "text": "As a general security measure, Siemens strongly recommends to protect network access to devices with appropriate mechanisms. In order to operate the devices in a protected IT environment, Siemens recommends to configure the environment according to Siemens\u0027 operational guidelines for Industrial Security (Download: https://www.siemens.com/cert/operational-guidelines-industrial-security), and to follow the recommendations in the product manuals.\nAdditional information on Industrial Security by Siemens can be found at: https://www.siemens.com/industrialsecurity",
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      }
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        "name": "Weak Authentication"
      },
      "notes": [
        {
          "category": "description",
          "text": "Affected systems do not properly secure their remote user authentication with the deprecated NTLM protocol. This could allow unauthenticated remote attackers, who have achieved a machine in the middle position, to relay NTLM authentication and impersonate a legitimate user. The potential impact depends on the services that are accessible, e.g. a SQL server used by WinCC.",
          "title": "CVE Description"
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          ]
        }
      ],
      "title": "CVE-2026-58114"
    }
  ]
}



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