Overview
A critical vulnerability identified as CVE-2025-30174 has been discovered in various versions of SIMATIC PCS neo, SINEC NMS, SINEMA Remote Connect, and Totally Integrated Automation Portal (TIA Portal) products. This vulnerability lies in the User Management Component (UMC) of these products and can be exploited by an unauthenticated remote attacker to cause a denial of service condition. This vulnerability presents a significant security risk, potentially leading to system compromise or data leakage.
Vulnerability Summary
CVE ID: CVE-2025-30174
Severity: High (CVSS: 7.5)
Attack Vector: Network
Privileges Required: None
User Interaction: None
Impact: Denial of service, Potential system compromise and data leakage
Affected Products
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Product | Affected Versions
SIMATIC PCS neo | All versions < V2.15.1.1 SINEC NMS | All versions < V2.15.1.1 SINEMA Remote Connect | All versions < V2.15.1.1 Totally Integrated Automation Portal (TIA Portal) | V17 - V20, All versions < V2.15.1.1 User Management Component (UMC) | All versions < V2.15.1.1 How the Exploit Works
The vulnerability arises from an out of bound read buffer overflow in the integrated User Management Component (UMC) of the affected products. An unauthenticated remote attacker can send specially crafted data packets to the targeted system. The system, not properly validating the size of the incoming data, may attempt to store it in a buffer that is smaller than the data size, causing an overflow condition. This can lead to a denial of service, and possibly, an attacker may execute arbitrary code on the system.
Conceptual Example Code
POST /umc/api/login HTTP/1.1
Host: target.example.com
Content-Type: application/json
{ "username": "admin", "password": "A"*10000 }In the above conceptual example, an attacker sends a large amount of data (represented by “A”*10000) as the password field to the login API endpoint of the UMC. This can lead to a buffer overflow if the system doesn’t properly validate the size of the incoming data.
Mitigation Guidance
Affected users are advised to apply the vendor-supplied patch immediately, upgrading to versions V2.15.1.1 or later. As a temporary measure, Web Application Firewalls (WAF) or Intrusion Detection Systems (IDS) can be used to block or alert of potential attacks.
