CyberHunter
Local dataset, no network
// Other services

Port 8400: cvd

Port 8400 is assigned by IANA to cvd (cvd).

8400

How cvd works

Other services
client:8400cvdresponse client:8400cvdresponse

The client sends a request to port 8400 and the cvd 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 8400 dangerous?

We have no specific security note for port 8400. 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 8400

ServicePortTransportDescriptionReferenceUpdated
cvd 8400 TCP, UDP cvd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 8400, and is it reachable?

Linux

sudo ss -ltnup 'sport = :8400'      # process listening on 8400
sudo lsof -nP -i :8400

macOS

sudo lsof -nP -i :8400

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 8400 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 8400
netstat -ano | findstr :8400

From another machine

nmap -p 8400 -sV <host>
sudo nmap -sU -p 8400 <host>
nc -zv <host> 8400

Block it in the firewall

sudo ufw deny 8400/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 8400" -Direction Inbound -LocalPort 8400 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 8400 used for?

Port 8400 is assigned by IANA to cvd (cvd).

Is port 8400 TCP or UDP?

Port 8400 is registered for TCP and UDP.

Is it safe to open port 8400?

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 8400 is open?

On Linux run "ss -ltnup 'sport = :8400'", on macOS "lsof -nP -i :8400", and on Windows "netstat -ano | findstr :8400" to see the local process. From another machine, "nmap -p 8400 <host>" shows whether it is reachable.

05 Related
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