ICSA-23-166-05: Siemens SIMATIC WinCC
CISA advisory · released 2023-06-13
Source record Collected from CISA's CSAF advisory feed
- Distribution label in the document: TLP:WHITE
- Revision 1, 2023-06-13 (final)
CISA's summary
Summary: Before SIMATIC WinCC V8, legacy OPC services (OPC DA (Data Access), OPC HDA (Historical Data Access), and OPC AE (Alarms & Events)) were used per default. These services were designed on top of the Windows ActiveX and DCOM mechanisms and do not implement state-of-the-art security mechanisms for authentication and encryption of contents. Starting with WinCC V8.0 the legacy OPC services are no longer enabled by default in new installations. Siemens recommends to use OPC UA instead and to disable the legacy OPC services. For deployments where the legacy OPC services are still in use, ensure that only trusted users are part of the SIMATIC HMI group.
Products, as the advisory lists them
| Vendor | Product | Version |
|---|---|---|
| Siemens | SIMATIC NET PC Software V14 | vers:all/* |
| Siemens | SIMATIC NET PC Software V15 | vers:all/* |
| Siemens | SIMATIC PCS 7 V8.2 | vers:all/* |
| Siemens | SIMATIC PCS 7 V9.0 | vers:all/* |
| Siemens | SIMATIC PCS 7 V9.1 | vers:all/* |
| Siemens | SIMATIC WinCC | vers:all/<V8.0 |
| Siemens | SINAUT Software ST7sc | vers:all/* |
DeSpy has not checked any unit, hardware revision or firmware.
Vulnerabilities in this advisory
- CVE-2023-28829 — CVE-2023-28829 · CWE-477
Before SIMATIC WinCC V8, legacy OPC services (OPC DA (Data Access), OPC HDA (Historical Data Access), and OPC AE (Alarms & Events)) were used per default. These services were designed on top of the Windows ActiveX and DCOM mechanisms and do not implement state-of-the-art security mechanisms for authentication and encryption of contents.
Acknowledgments, as the advisory lists them
- Siemens ProductCERT: reporting this vulnerability to CISA.
The advisory's legal notice
Siemens Security Advisories are subject to the terms and conditions contained in Siemens' underlying license terms or other applicable agreements previously agreed to with Siemens (hereinafter "License Terms"). To the extent applicable to information, software or documentation made available in or through a Siemens Security Advisory, the Terms of Use of Siemens' Global Website (https://www.siemens.com/terms_of_use, hereinafter "Terms of Use"), in particular Sections 8-10 of the Terms of Use, shall apply additionally. In case of conflicts, the License Terms shall prevail over the Terms of Use.
Sources
DeSpy's copy of this version is dated 2026-09-28.
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