Microsoft IIS 4.0 and 5.0 with the IISADMPWD virtual directory installed allows a remote attacker to cause a denial of service via a malformed request to the inetinfo.exe program, aka the "Undelimited .HTR Request" vulnerability.
From 神龙GPT (AIGC)
Microsoft IIS 4.0和5.0，带有 IISADMPWD 虚拟目录安装，允许远程攻击者通过构造错误的请求给 inetinfo.exe 程序发起拒绝服务攻击，也被称为“无限.HTR 请求”漏洞。