Publication Date:
Last Update:
Current Version: V1.1
CVSS v3.1 Base Score: 6.2
CVSS v4.0 Base Score: 6.9
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Affected Product and Versions Remediation

All versions < V9.1 SP2 UC04
affected by CVE-2023-50821
Update to V9.1 SP2 UC04 or later version

All versions
affected by CVE-2023-50821
Currently no fix is available

All versions < V18 Update 4
affected by CVE-2023-50821
Update to V18 Update 4 or later version

All versions < V19 Update 1
affected by CVE-2023-50821
Update to V19 Update 1 or later version

All versions < V7.5 SP2 Update 16
affected by CVE-2023-50821
Update to V7.5 SP2 Update 16 or later version

All versions < V8.0 Update 5
affected by CVE-2023-50821
Update to V8.0 Update 5 or later version
  • Activate SIMATIC Logon in the User Administrator of the SIMATIC PCS 7 Operator Stations

Product-specific remediations or mitigations can be found in the section Affected Products and Solution.
Please follow the General Security 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

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This chapter describes all vulnerabilities (CVE-IDs) addressed in this security advisory. Wherever applicable, it also documents the product-specific impact of the individual vulnerabilities.

CVSS v3.1 Base Score 6.2
CVSS v3.1 Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
CVSS v4.0 Base Score 6.9
CVSS v4.0 Vector CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CWE CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

  • Doukani Mohammed Adam from Resilience (resilience.sa) for reporting the vulnerability

https://www.siemens.com/cert/advisories
V1.0 (2024-04-09): Publication Date
V1.1 (2024-07-09): Added fix for SIMATIC WinCC V8.0 and SIMATIC WinCC Runtime Professional V18