Although the exact "vdesk hangupphp3 exploit" is extinct in modern web applications (PHP3 died over two decades ago), its class of vulnerability is alive and well. This includes:
The attacker first authenticates to the vDesk portal as a low-privileged user (e.g., a support agent). The system creates a PHP session file containing the user's ID, call queue status, and telephony handles. vdesk hangupphp3 exploit
An attacker would first locate a VDesk installation by looking for common signatures: Although the exact "vdesk hangupphp3 exploit" is extinct