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CVE-2025-40797: Out-of-Bounds Read Vulnerability in SIMATIC PCS neo’s User Management Component

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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.

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Disclaimer:

The information and code presented in this article are provided for educational and defensive cybersecurity purposes only. Any conceptual or pseudocode examples are simplified representations intended to raise awareness and promote secure development and system configuration practices.

Do not use this information to attempt unauthorized access or exploit vulnerabilities on systems that you do not own or have explicit permission to test.

Ameeba and its authors do not endorse or condone malicious behavior and are not responsible for misuse of the content. Always follow ethical hacking guidelines, responsible disclosure practices, and local laws.

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