known port assignments and vulnerabilities
threat/application/port search:
| Port(s) | Protocol | Service | Details | Source |
|---|
| 5357 | tcp,udp | wsdapi | Used by Microsoft Network Discovery, should be filtered for public networks. Disabling Network Discovery for any public network profile should close the port unless it's being used by another potentially malicious service. To disable Network Discovery for a public profile, navigate to:
- Control Panel\Network and Internet\Network and Sharing Center\Advanced sharing settings
- disable Network Discovery for any public network Port should be correctly mapped by the Windows Firewall to only accept connections from the local network. Malicious services using this port:
Trojan.win32.monder.gen (a.k.a Trojan.Vundo) Port is also IANA registered for:
Web Services for Devices (WSD) - a network plug-and-play experience that is similar to installing a USB device. WSD allows network-connected IP-based devices to advertise their functionality and offer these services to clients by using the Web Services protocol. WSD communicates over HTTP (TCP port 5357), HTTPS (TCP port 5358), and multicast to UDP port 3702. | SG |
| 5357 | tcp,udp | wsdapi | Web Services for Devices, registered 2005-08 | IANA |
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Related ports: 3702 5358
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External Resources
SANS Internet Storm Center: port 5357
Notes:
Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.
UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming and realtime gaming, where dropping some packets is preferable to waiting for delayed data.
When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.
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FAQs
Port 5357 Details. Used by Microsoft Network Discovery, should be filtered for public networks. Disabling Network Discovery for any public network profile should close the port unless it's being used by another potentially malicious service.
What is TCP port 5357 used for? ›
WSDAPI uses TCP port 5357 for HTTP traffic and TCP port 5358 for HTTPS traffic by default. These ports are reserved for lower privilege processes through a URL reservation in HTTP. sys, and are also reserved with IANA.
What port does network Discovery use? ›
Network Discovery (WSD-In) Creates an inbound rule to discover devices via Function Discovery on UDP port 3702.
Is SMTP port 587 TCP or UDP? ›
SMTP 587: TCP, UDP, SSL, or TLS
It typically uses TCP as a transport protocol.
Is port 5357 vulnerable? ›
Port 5357 Details. Used by Microsoft Network Discovery, should be filtered for public networks. Disabling Network Discovery for any public network profile should close the port unless it's being used by another potentially malicious service.
Is WSDAPI vulnerable? ›
WSDAPI was introduced in Windows Vista and hence earlier versions of Windows are not vulnerable. Only systems with the WSD TCP ports active and listening are vulnerable to the most likely attack vector.
How to tell if it's TCP or UDP? ›
TCP data packets have a sequencing number in the header to maintain the order of transmission. UDP data packets arrive in no fixed order, and incorrect sequencing cannot be detected or corrected.
What are TCP UDP connections? ›
The main difference between TCP (transmission control protocol) and UDP (user datagram protocol) is that TCP is a connection-based protocol and UDP is connectionless. While TCP is more reliable, it transfers data more slowly. UDP is less reliable but works more quickly.
Is UDP still used? ›
Numerous key Internet applications use UDP, including: the Domain Name System (DNS), the Simple Network Management Protocol (SNMP), the Routing Information Protocol (RIP) and the Dynamic Host Configuration Protocol (DHCP). Voice and video traffic is generally transmitted using UDP.
What protocol does network discovery use? ›
There are three primary discovery protocols: Simple Network Management Protocol (SNMP), Link Layer Discovery Protocol (LLDP), and ping. SNMP is an Internet Standard protocol that allows IT teams to aggregate and organize data about the devices on a network. LLDP is a vendor-neutral protocol.
All HTTPS web traffic goes to port 443. Network services that use HTTPS for encryption, such as DNS over HTTPS, also connect at this port.
What is the UDP port for WS discovery? ›
Web Services Dynamic Discovery (WS-Discovery) is a technical specification that defines a multicast discovery protocol to locate services on a local network. It operates over TCP and UDP port 3702 and uses IP multicast address 239.255. 255.250 or ff02::c.
Should I use port 465 or 587? ›
Originally, the Simple Mail Transfer Protocol (SMTP) used port 25. Today, SMTP should instead use port 587 — this is the port for encrypted email transmissions using SMTP Secure (SMTPS). Port 465 is also used sometimes for SMTPS. However, this is an outdated implementation and port 587 should be used if possible.
Does SMTP run on TCP or UDP? ›
SMTP and Email
There are three common protocols used to deliver email over the Internet: the Simple Mail Transfer Protocol (SMTP), the Post Office Protocol (POP), and the Internet Message Access Protocol (IMAP). All three use TCP, and the last two are used for accessing electronic mailboxes.
What port does POP3 use? ›
POP3 works on the following two ports by default: port 110: default, non-encrypted port; and. port 995: should be used when the user needs to connect using POP3 securely.
Which port does WS-Discovery use for message exchange? ›
For more information about Resolve messages, see section 6.1 of the WS-Discovery Specification. A Resolve message is sent by UDP multicast to port 3702.
What is port 5358 used for? ›
Port 5358 Details
WSD allows network-connected IP-based devices to advertise their functionality and offer these services to clients by using the Web Services protocol. WSD communicates over HTTP (TCP port 5357), HTTPS (TCP port 5358), and multicast to UDP port 3702.
What ports does EMC NetWorker use for TCP? ›
NetWorker Service Ports:
- 7937, 7938 - Fixed ports. Each NetWorker host uses these ports to start communication.
- 7937 - 9936 - Variable ports. NetWorker dynamically opens ports. A NetWorker host can allocate any port that is defined in this port range at random.
Network discovery is a setting that affects whether your computer can see (find) other computers and devices on the network and whether other computers on the network can see your computer. It's one of several settings that are turned on when you turn on network sharing.
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