CVE-1999-0280 in Internet Explorer
Summary
by MITRE
remote command execution in microsoft internet explorer using .lnk and .url files.
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Analysis
by VulDB Data Team • 04/16/2026
The vulnerability described in CVE-1999-0280 represents a critical remote command execution flaw in Microsoft Internet Explorer that leverages malicious .lnk and .url files to compromise systems. This vulnerability emerged during a period when web browsers were rapidly evolving to handle various file types and protocols, creating numerous attack vectors that adversaries could exploit. The flaw specifically targeted how Internet Explorer processed shortcut files and URL references when displayed within web browser contexts, allowing remote attackers to execute arbitrary commands on vulnerable systems without user interaction.
The technical implementation of this vulnerability stems from Internet Explorer's insufficient validation of file paths and command execution parameters when processing .lnk and .url files embedded in web pages. When a user visited a malicious website containing specially crafted HTML code referencing these file types, the browser would interpret and execute commands contained within the file references. The vulnerability exploited the way Internet Explorer handled relative paths and command parameters in these file types, particularly when they contained embedded executable commands or references to system utilities. This flaw essentially allowed attackers to bypass normal security restrictions by leveraging the browser's trust in local file references and the inherent system-level permissions associated with shortcut file processing.
The operational impact of CVE-1999-0280 was severe and widespread, as it enabled attackers to gain complete system compromise without requiring user interaction or specific exploitation techniques. Once a victim visited an infected webpage, the malicious commands would execute automatically, potentially leading to complete system takeover, data exfiltration, or further network propagation. This vulnerability particularly affected enterprise environments where users frequently visited untrusted websites and where the browser was often the primary attack vector for malware distribution. The remote nature of the exploit meant that attackers could compromise systems from anywhere in the world, making it particularly dangerous for organizations with limited network security controls.
The vulnerability aligns with several CWE categories including CWE-78 for improper neutralization of special elements used in OS commands and CWE-20 for improper input validation. From an ATT&CK framework perspective, this vulnerability maps to techniques such as T1059 for command and scripting interpreter and T1203 for exploitation for client execution, demonstrating how web-based attacks can lead to system-level command execution. Organizations affected by this vulnerability needed to implement immediate mitigations including browser updates, network-level filtering of malicious file types, and user education regarding unsafe web browsing practices. The incident highlighted the importance of proper input validation and the dangers of trusting file references from untrusted sources, contributing to improved security practices in web browser development and network security implementations.