CVE-2025-40797 Denial of service in SIMATIC PCS neo V4.1
An unauthenticated remote attacker can cause a denial of service in Siemens SIMATIC PCS neo via an out-of-bounds read in the UMC component.
- 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-2025-40797?
CVE-2025-40797 is a high-severity denial of service vulnerability in Siemens SIMATIC PCS neo V4.1, 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 PCS neo V4.1 (All versions), SIMATIC PCS neo V5.0 (All versions), SIMATIC PCS neo V6.0 (All versions < V6.0 SP1 Update 1), User Management Component (UMC) (All versions < V2.15.1.3). Affected products contain a out-of-bounds read vulnerability in the integrated UMC component. This could allow an unauthenticated remote attacker to cause a denial of service condition.
Weakness: CWE-125
Which versions are affected by CVE-2025-40797?
It affects 2 products.
Products include Siemens Simatic Pcs Neo, Siemens User Management Component.
How do I fix CVE-2025-40797?
No fix has been published for CVE-2025-40797 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-40797 being exploited?
There is no known exploitation of CVE-2025-40797 in the wild and no public exploit code.
Other vulnerabilities in Siemens SIMATIC PCS neo V4.1
Sources
Also known as GHSA-5c33-c25j-fpxq.