RPC rpcbind Non-standard Port Assignment Filter Bypass

medium Nessus Plugin ID 20759
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.


An ONC RPC portmapper is running on the remote host.


The RPC portmapper is running on this port.

The portmapper allows someone to get the port number of each RPC service running on the remote host by sending either multiple lookup requests or a DUMP request.

This service should only run on port 111. However on some operating systems it also listens on different UDP ports. This might allow an attacker to circumvent firewall rules.


Disable this service if RPC are not used, or update your firewall rules if needed.

Plugin Details

Severity: Medium

ID: 20759

File Name: rpc_portmap_port32771.nasl

Version: 1.13

Type: remote

Family: RPC

Published: 5/25/2007

Updated: 7/27/2018

Dependencies: rpc_portmap.nasl

Risk Information


Risk Factor: Medium

Score: 5.9


Risk Factor: Medium

Base Score: 4

Temporal Score: 3

Vector: AV:N/AC:L/Au:S/C:P/I:N/A:N

Temporal Vector: E:U/RL:OF/RC:C

Vulnerability Information

Required KB Items: rpc/portmap/different_port

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 6/4/1997

Reference Information

CVE: CVE-1999-0632, CVE-1999-0189

BID: 205