CVE-2024-49775: Siemens UMC Component RCE Vulnerability

CVE-2024-49775 Overview

A critical heap-based buffer overflow vulnerability has been identified in multiple Siemens industrial automation products, specifically within the integrated User Management Component (UMC). This vulnerability affects a wide range of Siemens products including Opcenter Execution Foundation, Opcenter Intelligence, Opcenter Quality, Opcenter RDnL, SIMATIC PCS neo, SINEC NMS, and Totally Integrated Automation Portal (TIA Portal). The flaw allows an unauthenticated remote attacker to execute arbitrary code on affected systems, posing a severe risk to industrial control environments.

Critical Impact
Unauthenticated remote attackers can exploit this heap-based buffer overflow in the UMC component to achieve arbitrary code execution, potentially compromising critical industrial control systems.

Affected Products

Opcenter Execution Foundation (All versions < V2501.0001)
Opcenter Intelligence (All versions < V2501.0001)
Opcenter Quality (All versions < V2512)
Opcenter RDnL (All versions < V2410)
SIMATIC PCS neo V4.0 (All versions)
SIMATIC PCS neo V4.1 (All versions < V4.1 Update 3)
SIMATIC PCS neo V5.0 (All versions < V5.0 Update 1)
SINEC NMS (All versions if operated in conjunction with UMC < V2.15)
Totally Integrated Automation Portal (TIA Portal) V16 (All versions)
Totally Integrated Automation Portal (TIA Portal) V17 (All versions)
Totally Integrated Automation Portal (TIA Portal) V18 (All versions)
Totally Integrated Automation Portal (TIA Portal) V19 (All versions)

Discovery Timeline

December 16, 2024 - CVE-2024-49775 published to NVD
January 13, 2026 - Last updated in NVD database

Technical Details for CVE-2024-49775

Vulnerability Analysis

This vulnerability is classified as CWE-122 (Heap-based Buffer Overflow), a memory corruption flaw that occurs when data is written beyond the allocated bounds of a heap buffer. In the context of CVE-2024-49775, the integrated User Management Component (UMC) within affected Siemens products fails to properly validate input data, allowing attackers to overflow heap memory structures.

The exploitation of this vulnerability does not require authentication, meaning any network-accessible attacker can target vulnerable systems. Given that these products are commonly deployed in industrial control system (ICS) environments, successful exploitation could lead to complete system compromise, manipulation of industrial processes, or lateral movement within operational technology (OT) networks.

Root Cause

The root cause of CVE-2024-49775 lies in insufficient bounds checking within the UMC component's memory allocation routines. When processing specially crafted input, the component allocates a heap buffer of inadequate size or fails to validate the length of incoming data before copying it into the buffer. This allows an attacker to overwrite adjacent heap memory, potentially corrupting critical data structures or function pointers that can be leveraged to redirect execution flow.

Attack Vector

The attack vector is network-based, requiring no authentication or user interaction. An attacker can remotely send malicious requests to the UMC component, triggering the heap overflow condition. The attack complexity is low, making this vulnerability particularly dangerous for internet-exposed or poorly segmented industrial systems.

The exploitation chain typically involves:

Identifying a network-accessible instance of an affected Siemens product
Crafting malicious input designed to overflow the heap buffer in the UMC component
Overwriting heap metadata or adjacent memory structures to gain control of execution
Executing arbitrary code with the privileges of the vulnerable service

Given that no verified proof-of-concept code is publicly available, organizations should refer to the Siemens Security Advisory SSA-928984 for detailed technical information and indicators.

Detection Methods for CVE-2024-49775

Indicators of Compromise

Unusual network traffic patterns targeting UMC service ports on affected Siemens products
Unexpected crashes or service restarts of Opcenter, SIMATIC PCS neo, SINEC NMS, or TIA Portal applications
Memory corruption artifacts or heap corruption errors in application logs
Anomalous process behavior or unexpected child processes spawned by industrial automation software

Detection Strategies

Deploy network intrusion detection systems (NIDS) to monitor for anomalous traffic patterns targeting industrial automation systems
Implement application-level logging and monitoring for UMC component activities
Utilize endpoint detection and response (EDR) solutions capable of detecting heap exploitation techniques
Monitor for unusual memory allocation patterns or heap corruption indicators in affected applications

Monitoring Recommendations

Enable verbose logging on all affected Siemens products and centralize log collection for SIEM analysis
Implement network segmentation monitoring to detect unauthorized access attempts to OT/ICS networks
Deploy honeypots mimicking vulnerable Siemens products to detect active exploitation attempts
Establish baseline behavior profiles for affected applications to detect anomalous execution patterns

How to Mitigate CVE-2024-49775

Immediate Actions Required

Inventory all Siemens industrial automation products to identify vulnerable versions
Prioritize patching based on network exposure and criticality of affected systems
Implement network segmentation to isolate affected systems from untrusted networks
Restrict network access to UMC components using firewall rules and access control lists

Patch Information

Siemens has released security updates addressing this vulnerability. Organizations should upgrade to the following versions:

Opcenter Execution Foundation: V2501.0001 or later
Opcenter Intelligence: V2501.0001 or later
Opcenter Quality: V2512 or later
Opcenter RDnL: V2410 or later
SIMATIC PCS neo V4.1: V4.1 Update 3 or later
SIMATIC PCS neo V5.0: V5.0 Update 1 or later
SINEC NMS: Operate in conjunction with UMC V2.15 or later

For TIA Portal V16, V17, V18, and V19, as well as SIMATIC PCS neo V4.0, consult the Siemens Security Advisory SSA-928984 for specific remediation guidance, as all versions may be affected.

Workarounds

Disable or restrict network access to the UMC component where feasible
Implement strict firewall rules to allow UMC access only from trusted management networks
Deploy application-layer firewalls or web application firewalls capable of inspecting and filtering malicious requests
Consider deploying virtual patching solutions to provide interim protection while planning upgrade activities

bash

# Example: Restrict network access to UMC service ports using iptables
# Adjust port numbers based on your specific deployment
iptables -A INPUT -p tcp --dport 4002 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 4002 -j DROP