ICSA-25-254-02: Siemens SIMATIC Virtualization as a Service (SIVaaS)

ICSA-25-254-02: Siemens SIMATIC Virtualization as a Service (SIVaaS) ↗ source

September 11, 2025 CISA ICS Advisory

Source: https://www.cisa.gov/news-events/ics-advisories/icsa-25-254-02

Summary

SIMATIC Virtualization as a Service (SIVaaS) is affected by a vulnerability which exposes a network share without any authentication. This could allow an attacker to access or alter sensitive data without proper authorization. Siemens recommends to contact technical support to fix the vulnerability. CVE-2025-40804: The affected application exposes a network share without any authentication. This could allow an attacker to access or alter sensitive data without proper authorization.

Advisory Details CISA ICS CSAF feed

Advisory ID: ICSA-25-254-02
Status: Final · version 1
Initial release: 2025-09-09
Last revised: 2025-09-09
Vendor: Siemens
Critical infrastructure sectors: Critical Manufacturing
Deployed: Worldwide
Vendor headquarters: Germany

Republished vendor advisory. This ICSA is a verbatim republication of Siemens ProductCERT SSA-534283 from a direct conversion of the vendor's Common Security Advisory Framework (CSAF) advisory. This is republished to CISA's website as a means of increasing visibility and is provided "as-is" for informational purposes only. CISA is not responsible for the editorial or technical accuracy of republished advisories and provides no warranties of any kind regarding any information contained within this advisory. Further, CISA…

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

Credit: Siemens ProductCERT; Tim Dijkman (Powerspex)

Affected products (1)

SIMATIC Virtualization as a Service (SIVaaS) — all versions

From CISA's machine-readable CSAF 2.0 advisory (JSON).

Vulnerabilities as Stated by the Advisory

CVE	Weakness	CVSS v3	Details
CVE-2025-40804	CWE-732 Incorrect Permission Assignment for Critical Resource	9.1 Critical	CVE-2025-40804 The affected application exposes a network share without any authentication. This could allow an attacker to access or alter sensitive data without proper authorization. Vendor fix: Contact Technical Support for assistance Affected, fixed & timeline Affected: SIMATIC Virtualization as a Service (SIVaaS) all versions

Scores and weakness types are as CISA or the republishing vendor stated them in this advisory; the linked CVE pages carry the independently enriched CVSS and SSVC assessments.

News Coverage

No coverage found in monitored research blogs or news feeds.

CVEs Referenced in This Publication

CVE	CVSS	Affected
CVE-2025-40804	9.1 Critical	Siemens SIMATIC Virtualization as a Service (SIVaaS) A vulnerability has been identified in SIMATIC Virtualization as a Service (SIVaaS) (All versions). The affected application exposes a network share …

Named by the advisory itself. Each CVE links to its tracked detail page.

Vendors Named in This Publication

Siemens 2 KEV

Each vendor links to its Known Exploited Vulnerabilities catalog page. Only vendors that appear in the KEV catalog are listed, either because the publication cites one of their KEV entries or because it names them directly.