Sipera Systems' VIPER Lab listed its top five VoIP vulnerabilities of 2007, which ranged from toll fraud to remote eavesdropping.
"By highlighting the top five vulnerabilities, issuing VIPER Lab Threat
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Advisories, and
providing the Sipera IPCS product line, Sipera is helping enterprises and service providers secure
their VoIP systems," said a statement by Krishna Kurapati, Sipera founder and CTO.
The other three security holes highlighted were the Skype worm, which utilised that software's chat function; Vishing, in which malicious users spoof their phone number to gain sensitive information; and VoIP hopping, which can give hackers access to VLANs by making a PC mimic a VoIP phone.