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If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


Home >> Browse Vulnerability Assessment Database >> Firewalls >> icmp netmask request


Vulnerability Assessment Details

icmp netmask request

Vulnerability Assessment Summary
Sends an ICMP_MASKREQ

Detailed Explanation for this Vulnerability Assessment

The remote host answered to an ICMP_MASKREQ query and sent us its
netmask .

A possible hacker can use this information to understand how your network is set up
and how the routing is done. This may help him to bypass your filters.

Solution : reconfigure the remote host so that it does not answer to those
requests. Set up filters that deny ICMP packets of type 17.

Network Security Threat Level: Low

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 1999 Renaud Deraison

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