CVE-2000-0007 in PC-Cillin
Summary
by MITRE
Trend Micro PC-Cillin does not restrict access to its internal proxy port, allowing remote attackers to conduct a denial of service.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 04/20/2026
The vulnerability identified as CVE-2000-0007 affects Trend Micro PC-Cillin antivirus software, representing a critical security flaw in network service configuration. This issue stems from the improper restriction of access to an internal proxy port within the antivirus application, creating an unintended attack surface that exposes the system to remote exploitation. The vulnerability manifests when the software fails to implement proper access controls on its internal network components, allowing unauthorized remote entities to interact with the proxy service without authentication or authorization mechanisms.
The technical flaw involves the absence of proper network access controls on the internal proxy port functionality within Trend Micro PC-Cillin. This proxy port typically serves as an intermediary communication channel for various network operations, including updates, configuration management, and network monitoring activities. When access is not properly restricted, remote attackers can leverage this port to establish connections and potentially manipulate the service behavior. The vulnerability specifically impacts the authentication and authorization mechanisms that should normally govern access to internal system components, creating a pathway for malicious actors to exploit the service directly.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it fundamentally compromises the security posture of systems running Trend Micro PC-Cillin. Remote attackers can exploit the unrestricted proxy port to initiate denial of service attacks by overwhelming the service with requests or by manipulating the proxy functionality to disrupt normal operations. The vulnerability allows attackers to potentially disrupt legitimate network communications, interfere with security updates, or even gain unauthorized access to system resources that should remain protected. This creates a significant risk for enterprise environments where the antivirus software operates as a critical security control.
The security implications align with CWE-284, which addresses improper access control vulnerabilities in software systems. This classification specifically addresses situations where software fails to properly enforce access restrictions on network services or internal components. From an ATT&CK framework perspective, this vulnerability maps to techniques involving initial access through network services and privilege escalation via service manipulation. The vulnerability represents a classic case of insufficient network segmentation where internal services are exposed to external networks without proper boundary controls. Organizations utilizing Trend Micro PC-Cillin should implement immediate network segmentation measures, configure proper firewall rules to restrict access to the affected proxy port, and ensure that internal services remain protected from external threats through proper network architecture design.
Mitigation strategies should include implementing network-level restrictions to prevent unauthorized access to the internal proxy port, configuring proper authentication mechanisms for any remaining access points, and conducting regular security assessments of network services. System administrators should also consider disabling unnecessary network services, applying vendor-provided patches or updates, and monitoring network traffic for suspicious activity on the affected port. The vulnerability demonstrates the critical importance of proper service hardening and network access control implementation, as even legitimate security software can create attack vectors when not properly configured to restrict access to internal components. Organizations should establish comprehensive network security policies that address the protection of internal services and implement regular vulnerability assessments to identify similar exposure points in their security infrastructure.