It indicates a Denial-of-Service (DoS) vulnerability in Microsoft Internet Information Service (IIS) Web-based Distributed Authoring and Versioning (WebDAV) component.
There exists a vulnerability in IIS 5.0 that allows remote attackers to cause a DoS on a target system via a series of malformed WebDAV requests.
Any unprotected IIS 5.0 is vulnerable to the attack.
An attacker can cause DoS on a target system
Apply appropriate patches and/or upgrade the system to the latest non-vulnerable version.