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F5 BigIP Access Policy Manager Session Exhaustion Denial of Service

This module exploits a resource exhaustion denial of service in F5 BigIP devices. An unauthenticated attacker can establish multiple connections with BigIP Access Policy Manager (APM) and exhaust all available sessions defined in customer license. In the first step of the BigIP APM negotiation the client sends a HTTP request. The BigIP system creates a session, marks it as pending and then redirects the client to an access policy URI. Since BigIP allocates a new session after the first unauthenticated request, and deletes the session only if an access policy timeout expires, the attacker can exhaust all available sessions by repeatedly sending the initial HTTP request and leaving the sessions as pending.

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Module Name



  • Denis Kolegov <dnkolegov [at]>
  • Oleg Broslavsky <ovbroslavsky [at]>
  • Nikita Oleksov <neoleksov [at]>




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/http/f5_bigip_apm_max_sessions msf auxiliary(f5_bigip_apm_max_sessions) > show actions ...actions... msf auxiliary(f5_bigip_apm_max_sessions) > set ACTION <action-name> msf auxiliary(f5_bigip_apm_max_sessions) > show options and set options... msf auxiliary(f5_bigip_apm_max_sessions) > run