CyberHunter
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// Other services

Port 132: cisco SYSMAINT

Port 132 is assigned by IANA to cisco-sys (cisco SYSMAINT).

132

How cisco-sys works

Other services
client:132cisco-sysresponse client:132cisco-sysresponse

The client sends a request to port 132 and the cisco-sys 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 132 dangerous?

We have no specific security note for port 132. 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 132

ServicePortTransportDescriptionReferenceUpdated
cisco-sys 132 TCP, UDP cisco SYSMAINT - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 132, and is it reachable?

Linux

sudo ss -ltnup 'sport = :132'      # process listening on 132
sudo lsof -nP -i :132

macOS

sudo lsof -nP -i :132

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 132 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 132
netstat -ano | findstr :132

From another machine

nmap -p 132 -sV <host>
sudo nmap -sU -p 132 <host>
nc -zv <host> 132

Block it in the firewall

sudo ufw deny 132/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 132" -Direction Inbound -LocalPort 132 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 132 used for?

Port 132 is assigned by IANA to cisco-sys (cisco SYSMAINT).

Is port 132 TCP or UDP?

Port 132 is registered for TCP and UDP.

Is it safe to open port 132?

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 132 is open?

On Linux run "ss -ltnup 'sport = :132'", on macOS "lsof -nP -i :132", and on Windows "netstat -ano | findstr :132" to see the local process. From another machine, "nmap -p 132 <host>" shows whether it is reachable.

05 Related
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