CVE-2006-5785 in Web Application Server
Summary
by MITRE
Unspecified vulnerability in SAP Web Application Server 6.40 before patch 136 and 7.00 before patch 66 allows remote attackers to cause a denial of service (enserver.exe crash) via a 0x72F2 sequence on UDP port 64999.
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Analysis
by VulDB Data Team • 04/26/2026
The vulnerability identified as CVE-2006-5785 represents a critical denial of service flaw within SAP Web Application Server versions 6.40 and 7.00 prior to specific patch releases. This weakness manifests through a targeted attack vector that exploits a specific sequence of data packets sent to UDP port 64999, causing the enserv.exe process to crash and subsequently disrupting system availability. The vulnerability affects the core application server functionality and demonstrates a significant weakness in input validation and error handling mechanisms within the SAP Web Application Server architecture.
The technical exploitation of this vulnerability involves sending a carefully crafted 0x72F2 sequence over UDP protocol to the designated port 64999, which triggers an unhandled exception within the enserv.exe process. This specific sequence appears to be processed by the server's network handler without proper validation, leading to memory corruption or stack overflow conditions that ultimately result in process termination. The flaw resides in the server's protocol handling logic, where malformed or unexpected data sequences are not properly sanitized before processing, creating an entry point for remote attackers to disrupt service availability.
From an operational impact perspective, this vulnerability poses a substantial risk to enterprise environments relying on SAP Web Application Server infrastructure. The remote nature of the attack means that adversaries can exploit this weakness from outside the network perimeter without requiring authentication or privileged access. The enserv.exe crash directly impacts the application server's ability to process requests, effectively rendering the affected system unavailable to legitimate users and potentially causing cascading failures in dependent applications and services. Organizations may experience extended downtime, loss of productivity, and potential financial impact from service disruption.
The vulnerability aligns with CWE-121, which addresses stack-based buffer overflow conditions, and represents a classic example of improper input validation that leads to process termination. From an ATT&CK framework perspective, this weakness maps to the T1499.004 technique for network denial of service attacks, specifically targeting application availability. Organizations should implement immediate patch management procedures to address this vulnerability, as well as network segmentation strategies to limit exposure of UDP port 64999. Additional mitigations may include implementing network access controls, monitoring for suspicious UDP traffic patterns, and establishing incident response procedures to quickly address potential exploitation attempts. The remediation process requires careful planning due to the critical nature of the affected application server components and the potential for service disruption during patch deployment.