CVE-2014-2733 in SINEMA Server
Summary
by MITRE
Siemens SINEMA Server before 12 SP1 allows remote attackers to cause a denial of service (web-interface outage) via crafted HTTP requests to port (1) 4999 or (2) 80.
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Analysis
by VulDB Data Team • 05/11/2026
The vulnerability identified as CVE-2014-2733 affects Siemens SINEMA Server versions prior to 12 SP1, representing a significant denial of service weakness in industrial network infrastructure software. This flaw resides within the web interface component of the SINEMA Server product, which is designed to provide remote monitoring and management capabilities for industrial environments. The vulnerability manifests through specially crafted HTTP requests that can be sent to specific port numbers, creating a critical operational disruption that impacts industrial control systems and their associated network management functions.
The technical implementation of this vulnerability stems from inadequate input validation within the web server component of the SINEMA Server software. When the system receives malformed HTTP requests on ports 4999 or 80, the processing logic fails to properly handle these crafted inputs, leading to unexpected behavior that results in service interruption. This type of vulnerability aligns with CWE-129, which addresses insufficient input validation, and represents a classic example of how improper request handling can lead to system instability. The attack vector is particularly concerning because it requires minimal privileges and can be executed remotely, making it accessible to threat actors without physical access to the industrial network.
The operational impact of this vulnerability extends beyond simple service interruption, as it directly affects the availability of critical industrial network management functions. In industrial environments where SINEMA Server is deployed for monitoring and control purposes, such a denial of service condition can compromise the ability to manage network infrastructure, potentially leading to extended downtime for industrial processes. The affected ports 4999 and 80 are commonly used for industrial communication protocols and web-based management interfaces respectively, making this vulnerability particularly dangerous in operational technology environments. This weakness can be categorized under ATT&CK technique T1499, which involves network denial of service attacks targeting industrial control systems.
Organizations utilizing Siemens SINEMA Server software should implement immediate mitigation strategies including applying the vendor-provided security patch for version 12 SP1 or later, which addresses the input validation deficiencies. Network segmentation and access controls should be strengthened to limit exposure of the affected ports to only authorized personnel, while monitoring systems should be enhanced to detect anomalous HTTP traffic patterns that may indicate exploitation attempts. Additionally, implementing intrusion detection systems capable of identifying malformed HTTP requests can provide early warning of potential attacks targeting this vulnerability. The remediation process should also include comprehensive testing of the patched software in non-production environments to ensure that the update does not introduce compatibility issues with existing industrial control system configurations.