CVE-1999-0412

CVE-1999-0412 describes a critical vulnerability in Microsoft IIS and other web servers, specifically affecting versions 2.0, 3.0, and 4.0 of Microsoft Internet Information Server/Services. This flaw allows an unauthenticated attacker to execute arbitrary commands with SYSTEM privileges by exploiting how the server loads ISAPI extensions, particularly through the GetExtensionVersion() function. With a CVSS score of 7.5 (HIGH), the vulnerability is easily exploitable over the network with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. While not currently on the CISA KEV catalog or the Hot List, an ExploitDB entry (EDB-19376) confirms the existence of public exploit code, though there is no evidence of active exploitation, Metasploit/Nuclei modules, or significant community discussion.