CVE-2025-40796 Memory corruption 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-2025-40796?
CVE-2025-40796 is a high-severity memory corruption 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-2025-40796?
It affects 2 products.
Products include Siemens Simatic Pcs Neo, Siemens User Management Component.
How do I fix CVE-2025-40796?
No fix has been published for CVE-2025-40796 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-40796 being exploited?
There is no known exploitation of CVE-2025-40796 in the wild and no public exploit code.
Other vulnerabilities in Siemens SIMATIC PCS neo V4.1
Sources
Also known as GHSA-rhj7-r272-hv9p.