CVE-2025-40804 Missing authorization in SIMATIC Virtualization as a Service (SIVaaS)
An attacker can access or modify sensitive data via an unauthenticated network share in Siemens SIVaaS.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-40804?
CVE-2025-40804 is a critical missing authorization vulnerability in Siemens SIMATIC Virtualization as a Service (SIVaaS), published on 9 Sep 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-732
Which versions are affected by CVE-2025-40804?
How do I fix CVE-2025-40804?
No fix has been published for CVE-2025-40804 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-40804 being exploited?
There is no known exploitation of CVE-2025-40804 in the wild and no public exploit code.
Sources
Also known as GHSA-5vcx-8m3x-7jmf.