Vulnerability in Siemens Simatic Virtualization As A Service (Sivaas)

CVE-2025-40804

A vulnerability has been identified in SIMATIC Virtualization as a Service (SIVaaS) (All versions). The affected application exposes a network share without any authentication. This could allow an attacker to access or alter sensitive data without proper authorization.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.004 (31.6th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-40804: held from 0.004 to 0.004.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2025-40804?
CVE-2025-40804 is a critical-severity vulnerability in Siemens Simatic Virtualization As A Service (Sivaas), classified under Incorrect Permission Assignment for Critical Resource. CVSS score: 9.1/10. Published 2025-09-09.
How severe is CVE-2025-40804?
Critical severity. CVSS v3 base score is 9.1 out of 10.