Attackers on the local subnet (intranet) can send malicious packets to the service, though it is usually blocked by firewall settings from the public internet. 4. Mitigation and Security Best Practices Disable Network Discovery:
Port 5357 can expose a system to several severe vulnerabilities depending on the underlying Windows patch level and service configuration. 1. HTTP.sys Remote Code Execution (CVE-2015-1635)
If network discovery and file sharing are not required on the server, disable the "Function Discovery Provider Host" and "Function Discovery Resource Publication" services. port 5357 hacktricks
Since WSDAPI uses HTTP, you can interact with it using standard tools. Use curl to view a default response.
"Recommendation: Block Port 5357/tcp on the perimeter firewall immediately. The exposed WS-Discovery service allowed for the enumeration of the primary Domain Controller hostname ('LEDGER-DC01') and internal network topology without authentication." Attackers on the local subnet (intranet) can send
You can utilize native Windows PowerShell commands to query WSD infrastructure directly without uploading external binaries: powershell
⚠️ Always have proper authorization before scanning or testing port 5357 on any system. Use curl to view a default response
When assessing port 5357, the primary risk is information disclosure. By querying this port, an attacker can extract metadata about the target system without authentication. Tools such as ntbscan or custom scripts utilizing the Python impacket library can send a probe to the port and receive a response containing the computer name, workgroup, and operating system version. This is critical intelligence for an attacker; knowing the exact OS version allows them to tailor exploits specifically for that environment, bypassing generic defenses. The enumeration of this port aligns with the HackTricks philosophy of "trust but verify"—assuming a network is secure until an open port reveals that a machine is unnecessarily broadcasting its fingerprint.
By default, Windows 10/11, Server 2016/2019/2022 listen on 0.0.0.0:5357 (turned on in "Network and Sharing Center").
the internal network to identify specific Windows versions or hardware models. Vulnerability Surface
In the world of internal network penetration testing, most hackers focus on the "big three": SMB (445), RDP (3389), and WinRM (5985/5986). However, subtle infiltration vectors often hide on less common ports. One such port is .