Overview
This report presents an in-depth look at a newly identified vulnerability, CVE-2025-40797, affecting the User Management Component (UMC) of Siemens’ SIMATIC PCS neo. This cybersecurity flaw could potentially grant unauthenticated remote players the ability to cause a denial of service condition, leading to potential system compromise and data leakage. The severity of this vulnerability underscores the importance of immediate mitigation.
Vulnerability Summary
CVE ID: CVE-2025-40797
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, Potential System Compromise, Data Leakage
Affected Products
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Product | Affected Versions
SIMATIC PCS neo V4.1 | All versions
SIMATIC PCS neo V5.0 | All versions
User Management Component (UMC) | All versions < V2.15.1.3
How the Exploit Works
The exploit takes advantage of an out-of-bounds read vulnerability in the UMC of SIMATIC PCS neo. An unauthenticated attacker can send specially crafted network requests to the UMC, leading to an out-of-bounds read condition. This condition could cause the UMC to crash or behave unexpectedly, potentially causing a denial of service condition or even system compromise and data leakage.
Conceptual Example Code
Below is a conceptual example of how an attack could occur. In this case, an HTTP request is sent to the vulnerable endpoint with a malicious payload:
POST /UMC_vulnerable_endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "Crafted string causing out-of-bounds read" }Mitigation Guidance
Affected parties should apply the vendor patch as soon as possible to address this vulnerability. If the patch cannot be immediately applied, the use of a web application firewall (WAF) or intrusion detection system (IDS) can serve as a temporary mitigation strategy. Regular updates and patches are the recommended way to guard against vulnerabilities such as CVE-2025-40797.