CVE-2000-0580 in Windows
Summary
by MITRE
Windows 2000 Server allows remote attackers to cause a denial of service by sending a continuous stream of binary zeros to various TCP and UDP ports, which significantly increases the CPU utilization.
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Analysis
by VulDB Data Team • 06/07/2025
This vulnerability represents a classic denial of service attack vector that exploited fundamental weaknesses in the Windows 2000 Server networking stack. The flaw specifically targeted the operating system's handling of incoming network traffic on both TCP and UDP protocols, where the system failed to properly validate or process malformed packets containing continuous streams of binary zeros. This particular attack pattern leveraged the fact that Windows 2000 Server's network protocol implementation did not adequately filter or reject such malformed traffic, causing the system to enter a continuous processing loop that consumed excessive CPU resources.
The technical execution of this vulnerability involved sending specially crafted packets containing null bytes to various network ports that the server was listening on, including common services such as HTTP, FTP, SMTP, and other TCP/UDP based applications. When the operating system attempted to process these packets, the kernel-level network drivers would consume significant processing cycles attempting to handle the malformed data, leading to sustained high CPU utilization that effectively rendered the system unresponsive to legitimate network requests. This type of attack falls under the category of resource exhaustion attacks and can be classified as a CWE-400 weakness related to uncontrolled resource consumption.
The operational impact of this vulnerability was substantial for organizations running Windows 2000 Server, as it could be executed with minimal technical expertise and required no authentication or privileged access to the target system. Attackers could easily implement this attack using readily available network tools and would typically see immediate results with CPU utilization reaching 100% on affected systems. The vulnerability particularly affected enterprise environments where Windows 2000 servers were commonly used as file servers, web servers, or domain controllers, making the impact potentially widespread and disruptive to business operations. This attack pattern aligns with techniques documented in the MITRE ATT&CK framework under the denial of service tactic, specifically targeting system resources through network-based attacks.
Organizations could mitigate this vulnerability through several approaches including implementing network filtering rules at firewalls and routers to block traffic containing null bytes on common ports, applying the relevant Microsoft security patches that addressed the kernel-level network processing issues, and configuring network access control lists to restrict access to critical services. The vulnerability also highlighted the importance of proper input validation and resource management in operating system kernel code, leading to improved security practices in subsequent Microsoft releases and broader industry awareness of the need for robust network protocol implementations. System administrators should have implemented monitoring solutions to detect unusual CPU utilization patterns and established incident response procedures to address such attacks promptly.