Port 5357 Hacktricks Jun 2026

Because WSD acts as an internal HTTP endpoint tied directly to the Windows HTTP sub-system ( http.sys ), it can occasionally be abused via Server-Side Request Forgery (SSRF) vulnerabilities found in other web applications running on the same host to bypass local firewall restrictions. 4. Post-Exploitation & Lateral Movement

Web Services Dynamic Discovery (WS-Discovery / WSDAPI)

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Restrict port 5357 to the local subnet or block it entirely on corporate networks where automated network discovery is unneeded.

It was a small leak, but in cybersecurity, leaks sink ships. With the hostname LEDGER-DC01 confirmed, Elena could now launch a targeted brute-force attack or a password spraying attempt against the VPN portal. She didn't need to guess the username format anymore; she knew the naming convention. Because WSD acts as an internal HTTP endpoint

Tracing the digital breadcrumbs, the analyst discovered this port belongs to the Web Services for Devices API (WSDAPI)

Using SpoolSample.exe :

From a penetration testing perspective, while it rarely offers direct remote code execution (RCE) on its own, it is an excellent source of network reconnaissance and can occasionally be abused for external entity attacks or NTLM relaying. 1. Protocol Overview