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IIS

IIS is Microsoft's web server. Attackers probe for version leaks, short name flaws, WebDAV misconfigs, ASPX shell upload, auth bypass, and post-access token abuse for escalation

:80 :443 6 guides 3 phases
1 min read Updated: Jul 14, 2026

What is IIS?

IIS (Internet Information Services) is Microsoft’s web server for hosting websites, APIs, and web applications on Windows systems. It’s commonly used for ASP.NET, .NET Core, and enterprise web apps.

IIS runs tightly integrated with Windows, which means web vulnerabilities often turn into system-level impact.

Common security issues

  • Outdated IIS versions or unpatched modules

  • Weak or misconfigured authentication (Basic, NTLM, Windows Auth)

  • Dangerous handlers enabled (WebDAV, ISAPI, CGI)

  • Misconfigured application pools

  • File upload leading to web shell execution

  • Directory traversal and source code disclosure

  • Insecure file permissions on web roots

  • Misconfigured request filtering

Default ports

  • 80 (HTTP)

  • 443 (HTTPS)

Enumeration

Turn discovery into specifics: services, users, and exposed resources. Confirm what’s reachable.

1

Vulnerability Discovery

IIS misconfigs, short name disclosure, and path enumeration guides

2

Exploitation

WebDAV abuse, ASPX shell upload, and auth attacks on IIS

3