CVE-2001-0876 in Windows
Summary
by MITRE
Buffer overflow in Universal Plug and Play (UPnP) on Windows 98, 98SE, ME, and XP allows remote attackers to execute arbitrary code via a NOTIFY directive with a long Location URL.
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Analysis
by VulDB Data Team • 10/01/2025
The vulnerability identified as CVE-2001-0876 represents a critical buffer overflow flaw within the Universal Plug and Play implementation of windows operating systems including windows 98 98se me and xp. this weakness specifically manifests in the handling of notify directives within the upnp protocol stack which is responsible for enabling devices to discover and communicate with each other on local networks. the flaw occurs when the system processes a notify message containing an excessively long location url parameter that exceeds the allocated buffer space in memory. this condition creates an exploitable scenario where malicious actors can craft specially formatted notify messages to overflow the designated memory buffer and potentially overwrite adjacent memory locations.
The technical nature of this vulnerability aligns with common software security weaknesses categorized under cwe-121 heap based buffer overflow as described in the common weakness enumeration framework. the flaw exploits the fundamental principle of insufficient input validation where the upnp service fails to properly validate the length of the location url parameter before processing it. when an attacker sends a notify directive with an oversized location url the system attempts to copy this data into a fixed size buffer without proper bounds checking. this classic buffer overflow condition allows an attacker to overwrite critical memory segments including return addresses and function pointers which can be manipulated to redirect program execution flow.
From an operational perspective this vulnerability presents significant risks to networked environments as it enables remote code execution without requiring authentication or prior access to the target system. the attack vector operates over standard network protocols and can be executed from any location on the network where the attacker can send crafted notify messages to the upnp service. windows operating systems that are configured to run upnp services and are accessible over the network become vulnerable targets. the impact extends beyond individual system compromise as upnp is often enabled by default on many consumer devices and enterprise systems, making this vulnerability particularly dangerous for widespread exploitation. successful exploitation could allow attackers to execute malicious code with the privileges of the upnp service account which typically runs with elevated system privileges.
The security implications of CVE-2001-0876 align with tactics described in the attack technique framework including technique t1059 command and scripting interpreter and t1068 exploit for privilege escalation. organizations running vulnerable windows systems should implement immediate mitigations including disabling upnp services when not required, applying available security patches from microsoft, and implementing network level controls to restrict access to upnp ports. network administrators should also consider deploying intrusion detection systems that can identify and block suspicious notify message patterns. the vulnerability demonstrates the importance of proper input validation and memory management practices in network services as highlighted by industry standards and best practices for secure coding. organizations should conduct comprehensive vulnerability assessments to identify all systems running upnp services and ensure proper patch management procedures are in place to address similar vulnerabilities in the future.