CyberHunter
Local dataset, no network
// Other services

Port 8003: Mulberry Connect Reporting Service

Port 8003 is assigned by IANA to mcreport (Mulberry Connect Reporting Service).

8003

How mcreport works

Other services
client:8003mcreportresponse client:8003mcreportresponse

The client sends a request to port 8003 and the mcreport 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 8003 dangerous?

We have no specific security note for port 8003. 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 8003

ServicePortTransportDescriptionReferenceUpdated
mcreport 8003 TCP, UDP Mulberry Connect Reporting Service - 2008-03-10

// source: IANA service name and port number registry

03 Check it

Which program uses port 8003, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8003'      # process listening on 8003
sudo lsof -nP -i :8003

macOS

sudo lsof -nP -i :8003

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8003 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8003
netstat -ano | findstr :8003

From another machine

nmap -p 8003 -sV <host>
sudo nmap -sU -p 8003 <host>
nc -zv <host> 8003

Block it in the firewall

sudo ufw deny 8003/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8003" -Direction Inbound -LocalPort 8003 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8003 used for?

Port 8003 is assigned by IANA to mcreport (Mulberry Connect Reporting Service).

Is port 8003 TCP or UDP?

Port 8003 is registered for TCP and UDP.

Is it safe to open port 8003?

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 8003 is open?

On Linux run "ss -ltnup 'sport = :8003'", on macOS "lsof -nP -i :8003", and on Windows "netstat -ano | findstr :8003" to see the local process. From another machine, "nmap -p 8003 <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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