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CVE-2025-30176: Buffer Overflow Vulnerability in Integrated UMC Component Leading to Denial of Service Condition

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Overview

The cybersecurity community has identified a critical vulnerability, CVE-2025-30176, that affects various versions of Siemens’ SIMATIC PCS neo, SINEC NMS, SINEMA Remote Connect, and Totally Integrated Automation Portal (TIA Portal), including the User Management Component (UMC). This vulnerability can potentially lead to system compromise or data leakage, making it a severe threat that requires immediate attention.

Vulnerability Summary

CVE ID: CVE-2025-30176
Severity: Critical, CVSS v3 Score of 7.5
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of Service, potential system compromise or data leakage

Affected Products

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Product | Affected Versions

SIMATIC PCS neo | V4.1, V5.0
SINEC NMS | All versions
SINEMA Remote Connect | All versions
Totally Integrated Automation Portal (TIA Portal) | V17, V18, V19, V20
User Management Component (UMC) | All versions < V2.15.1.1 How the Exploit Works

This critical vulnerability arises from an out-of-bounds read buffer overflow within the integrated UMC component of the affected products. An unauthenticated attacker can remotely exploit this vulnerability by sending specially crafted data to the targeted system. The overflow can cause the system to crash, resulting in a denial of service. In some instances, the exploit may also allow the attacker to execute arbitrary code or access sensitive information.

Conceptual Example Code

The following is a conceptual example of how the vulnerability might be exploited using a malicious payload.

POST /umc/vulnerable_endpoint HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "malicious_payload": "buffer_overflow_string" }

In this example, the “buffer_overflow_string” would be a crafted string of data designed to overflow the buffer and exploit the vulnerability.
It is advisable to apply the vendor-released patches immediately or use WAF/IDS solutions as temporary mitigation to prevent potential exploitation of this vulnerability.

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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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