CyberHunter
Local dataset, no network
// File transfer & sharing

Port 5842: Reversion Backup/Restore

Port 5842 is assigned by IANA to reversion (Reversion Backup/Restore).

5842

How reversion works

File transfer & sharing
client:58421/32/33/3reversion client:58421/32/33/3reversion

Files are sent over port 5842 in pieces and reassembled on the other side.

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
File transfer & sharing
01 Security

Is port 5842 dangerous?

We have no specific security note for port 5842. Its risk depends on the program actually listening on it. General advice for file transfer & sharing services:

  • Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).
  • Disable anonymous access and restrict shares or exports to known hosts.
  • Never publish file sharing protocols to the Internet.
02 Registry

IANA registry entries for port 5842

ServicePortTransportDescriptionReferenceUpdated
reversion 5842 TCP Reversion Backup/Restore - 2022-10-12
-5842-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 5842, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5842'      # process listening on 5842
sudo lsof -nP -i :5842

macOS

sudo lsof -nP -i :5842

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5842 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5842
netstat -ano | findstr :5842

From another machine

nmap -p 5842 -sV <host>
nc -zv <host> 5842

Block it in the firewall

sudo ufw deny 5842/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5842" -Direction Inbound -LocalPort 5842 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5842 used for?

Port 5842 is assigned by IANA to reversion (Reversion Backup/Restore).

Is port 5842 TCP or UDP?

Port 5842 is registered for TCP.

Is it safe to open port 5842?

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. Prefer encrypted protocols (SFTP, FTPS, SMB 3 with encryption).

How do I check if port 5842 is open?

On Linux run "ss -ltnup 'sport = :5842'", on macOS "lsof -nP -i :5842", and on Windows "netstat -ano | findstr :5842" to see the local process. From another machine, "nmap -p 5842 <host>" shows whether it is reachable.

05 Related
:445 SMB tcp · udp · critical risk :21 FTP tcp · udp · sctp · high risk :139 NetBIOS Session tcp · udp · high risk :69 TFTP udp · tcp · high risk :2049 NFS tcp · udp · sctp · high risk :873 rsync tcp · udp · high risk :20 File Transfer [Default Data] tcp · udp · sctp :115 Simple File Transfer Protocol tcp · udp

Latest vulnerability news

All news