CyberHunter
Local dataset, no network
// Other services

Port 7707: EM7 Dynamic Updates

Port 7707 is assigned by IANA to sync-em7 (EM7 Dynamic Updates).

7707

How sync-em7 works

Other services
client:7707sync-em7response client:7707sync-em7response

The client sends a request to port 7707 and the sync-em7 service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 7707 dangerous?

We have no specific security note for port 7707. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 7707

ServicePortTransportDescriptionReferenceUpdated
sync-em7 7707 TCP, UDP EM7 Dynamic Updates - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 7707, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7707'      # process listening on 7707
sudo lsof -nP -i :7707

macOS

sudo lsof -nP -i :7707

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7707 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7707
netstat -ano | findstr :7707

From another machine

nmap -p 7707 -sV <host>
sudo nmap -sU -p 7707 <host>
nc -zv <host> 7707

Block it in the firewall

sudo ufw deny 7707/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7707" -Direction Inbound -LocalPort 7707 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7707 used for?

Port 7707 is assigned by IANA to sync-em7 (EM7 Dynamic Updates).

Is port 7707 TCP or UDP?

Port 7707 is registered for TCP and UDP.

Is it safe to open port 7707?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 7707 is open?

On Linux run "ss -ltnup 'sport = :7707'", on macOS "lsof -nP -i :7707", and on Windows "netstat -ano | findstr :7707" to see the local process. From another machine, "nmap -p 7707 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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