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CVE-2025-40796: Denial of Service Vulnerability in SIMATIC PCS neo and UMC Products

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Overview

The cybersecurity vulnerability designated as CVE-2025-40796 is a critical issue affecting SIMATIC PCS neo V4.1, V5.0, and the User Management Component (UMC) in all versions prior to V2.15.1.3. The vulnerability is an out-of-bounds read issue in the integrated UMC component, which could allow an unauthenticated remote attacker to cause a denial of service condition.

Vulnerability Summary

CVE ID: CVE-2025-40796
Severity: High (7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service, potential system compromise, and potential data leakage

Affected Products

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Product | Affected Versions

SIMATIC PCS neo | V4.1 (All versions), V5.0 (All versions)
User Management Component (UMC) | All versions < V2.15.1.3 How the Exploit Works

An out-of-bounds read vulnerability exists in the integrated UMC component of the affected products. This vulnerability could be exploited by sending a specially crafted packet to the target system. An unauthenticated remote attacker could leverage this weakness to trigger a denial of service condition or potentially gain unauthorized access to the system.

Conceptual Example Code

Below is a conceptual example of a malicious packet that could potentially exploit this vulnerability:

POST /UMC/endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "exploit_payload": "buffer_overflow_data" }

This packet contains an artificially large or malformed data payload that, when processed by the flawed UMC component, might cause an out-of-bounds read error, leading to a denial of service or possibly system compromise.
Note: This is a hypothetical example. Actual exploit code may vary significantly.

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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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