CVE-1999-0801 in Patrol Agent
Summary
by MITRE
BMC Patrol allows remote attackers to gain access to an agent by spoofing frames.
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Analysis
by VulDB Data Team • 04/19/2026
The vulnerability identified as CVE-1999-0801 affects BMC Patrol, a network monitoring and management software solution that was widely deployed in enterprise environments during the late 1990s and early 2000s. This security flaw represents a significant weakness in the authentication mechanisms of the BMC Patrol agent component, which is responsible for monitoring network devices and reporting their status to the central management console. The vulnerability specifically targets the agent's frame handling capabilities, creating a pathway for unauthorized remote access that could compromise entire network monitoring infrastructures.
The technical flaw stems from insufficient validation of incoming network frames that the BMC Patrol agent processes. When the agent receives network traffic, it does not adequately verify the authenticity or origin of these frames, allowing malicious actors to craft and transmit spoofed network frames that appear to originate from legitimate sources within the network. This weakness in frame validation creates a condition where attackers can manipulate the agent's behavior by sending specially crafted packets that bypass normal authentication procedures. The vulnerability operates at the network protocol level, exploiting the trust relationship between network components and the agent's failure to implement robust frame integrity checking mechanisms.
The operational impact of this vulnerability extends far beyond simple unauthorized access, as it can lead to complete compromise of network monitoring capabilities and potentially broader system infiltration. An attacker who successfully exploits this vulnerability gains the ability to manipulate the agent's operations, potentially causing false alarms, suppressing legitimate alerts, or even gaining control over the monitoring infrastructure itself. This compromise undermines the fundamental security posture of organizations relying on BMC Patrol for network visibility, as the attacker can effectively become invisible to the monitoring system while simultaneously being able to manipulate its behavior. The vulnerability particularly affects environments where network monitoring is critical for security operations, making it a prime target for adversaries seeking persistent access to enterprise networks.
Organizations should implement immediate mitigations including network segmentation to isolate BMC Patrol agents from untrusted network segments, deployment of network access controls to restrict communication to authorized sources, and implementation of additional authentication layers beyond the basic frame validation. The vulnerability aligns with CWE-284, which addresses improper access control in network protocols, and represents a classic example of insufficient input validation that enables privilege escalation through network-based attacks. From an ATT&CK perspective, this vulnerability maps to techniques involving initial access through network service exploitation and privilege escalation by manipulating monitoring systems, potentially enabling later stages of the attack chain including lateral movement and data exfiltration. Regular network monitoring for unusual frame patterns and implementing intrusion detection systems that can identify spoofed traffic are essential defensive measures that should be deployed immediately to protect against exploitation of this vulnerability.