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// Other services

Port 40841: CSCP

Port 40841 is assigned by IANA to cscp (CSCP).

40841

How cscp works

Other services
client:40841cscpresponse client:40841cscpresponse

The client sends a request to port 40841 and the cscp 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 40841 dangerous?

We have no specific security note for port 40841. 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 40841

ServicePortTransportDescriptionReferenceUpdated
cscp 40841 TCP, UDP CSCP - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 40841, and is it reachable?

Linux

sudo ss -ltnup 'sport = :40841'      # process listening on 40841
sudo lsof -nP -i :40841

macOS

sudo lsof -nP -i :40841

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 40841 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 40841
netstat -ano | findstr :40841

From another machine

nmap -p 40841 -sV <host>
sudo nmap -sU -p 40841 <host>
nc -zv <host> 40841

Block it in the firewall

sudo ufw deny 40841/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 40841" -Direction Inbound -LocalPort 40841 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 40841 used for?

Port 40841 is assigned by IANA to cscp (CSCP).

Is port 40841 TCP or UDP?

Port 40841 is registered for TCP and UDP.

Is it safe to open port 40841?

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 40841 is open?

On Linux run "ss -ltnup 'sport = :40841'", on macOS "lsof -nP -i :40841", and on Windows "netstat -ano | findstr :40841" to see the local process. From another machine, "nmap -p 40841 <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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