Nessus SYN scanner

info Nessus Plugin ID 11219
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


It is possible to determine which TCP ports are open.


This plugin is a SYN 'half-open' port scanner. It shall be reasonably quick even against a firewalled target.

Note that SYN scans are less intrusive than TCP (full connect) scans against broken services, but they might cause problems for less robust firewalls and also leave unclosed connections on the remote target, if the network is loaded.


Protect your target with an IP filter.

Plugin Details

Severity: Info

ID: 11219

File Name: nessus_syn_scanner.nbin

Version: 1.40

Type: remote

Published: 2/4/2009

Updated: 9/16/2021

Dependencies: portscanners_stub.nasl, portscanners_settings.nasl