CyberHunter
LinkedIn profile - Bastien Cordier Email: contact@bastiencordier.pro
// Other services

Port 9877: The X.510 wrapper protocol

Port 9877 is assigned by IANA to x510 (The X.510 wrapper protocol).

9877

How x510 works

Other services
client:9877x510response client:9877x510response

The client sends a request to port 9877 and the x510 service answers.

Transport
TCP
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 9877 dangerous?

We have no specific security note for port 9877. 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 9877

ServicePortTransportDescriptionReferenceUpdated
x510 9877 TCP The X.510 wrapper protocol ITU-T X.510 / ISO/IEC 9584-11 2019-09-30
-9877-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 9877, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9877'      # process listening on 9877
sudo lsof -nP -i :9877

macOS

sudo lsof -nP -i :9877

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9877 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9877
netstat -ano | findstr :9877

From another machine

nmap -p 9877 -sV <host>
nc -zv <host> 9877

Block it in the firewall

sudo ufw deny 9877/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9877" -Direction Inbound -LocalPort 9877 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9877 used for?

Port 9877 is assigned by IANA to x510 (The X.510 wrapper protocol).

Is port 9877 TCP or UDP?

Port 9877 is registered for TCP.

Is it safe to open port 9877?

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 9877 is open?

On Linux run "ss -ltnup 'sport = :9877'", on macOS "lsof -nP -i :9877", and on Windows "netstat -ano | findstr :9877" to see the local process. From another machine, "nmap -p 9877 <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

Latest vulnerability news

All news