Cisco AVS transparent proxy unauthorized TCP relay

cisco-avs-unauth-tcp-relay (26351) The risk level is classified as LowLow Risk


The Cisco Application Velocity System (AVS) can be used as an unauthorized TCP relay. A remote attacker could use an affected Cisco AVS device to forward traffic to any TCP service that is able to process a request embedded within a HTTP POST method message. This could allow the attacker to perform malicious activity anonymously.


Bypass Security


Refer to Cisco Security Advisory cisco-sa-20060510-avs for upgrade or workaround information. See References.


  • cisco-sa-20060510-avs: Cisco Security Advisory: AVS TCP Relay Vulnerability.
  • BID-17937: Cisco Application Velocity System Open TCP Proxy Vulnerability
  • CVE-2006-2322: The transparent proxy feature of the Cisco Application Velocity System (AVS) 3110 5.0 and 4.0 and earlier, and 3120 5.0.0 and earlier, has a default configuration that allows remote attackers to proxy arbitrary TCP connections, aka Bug ID CSCsd32143.
  • OSVDB ID: 25459: Cisco Application Velocity System (AVS) Transparent Proxy Arbitrary Mail Relay
  • SA20079: Cisco Application Velocity System Open Relay Security Issue
  • SECTRACK ID: 1016056: Cisco Application Velocity System Lets Remote Users Relay TCP Connections

Platforms Affected:

  • Cisco Application Velocity System 3110 4.0
  • Cisco Application Velocity System 3110 5.0
  • Cisco Application Velocity System 3120 5.0


May 10, 2006

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