By default, IIS 4.0 has a virtual directory /IISADMPWD which contains files that can be used as proxies for brute force password attacks, or to identify valid users on the system.
CVSS Severity (version 2.0):
Impact Subscore: 10.0
Exploitability Subscore: 10.0
CVSS Version 2 Metrics:
Access Vector: Network exploitable
Access Complexity: Low
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
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19990209 ALERT: IIS4 allows proxied password attacks over NetBIOS
19990209 Re: IIS4 allows proxied password attacks over NetBIOS
Vulnerable software and versions