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IOS is router firmware developed and distributed by Cisco Systems. IOS functions on numerous Cisco devices, including routers and switches. A problem in IOS releases supporting the Point to Point Tunneling Protocol (PPTP) could make it possible for remote users to cause a Cisco router to crash. The problem occurs when a malformed PPTP packet is sent to port 1723 on the router. If this occurs, the router must be reset to regain normal functionality.

IOS is router firmware developed and distributed by Cisco Systems. IOS functions on numerous Cisco devices, including routers and switches. A problem in IOS releases supporting the Point to Point Tunneling Protocol (PPTP) could make it possible for remote users to cause a Cisco router to crash. The problem occurs when a malformed PPTP packet is sent to port 1723 on the router. If this occurs, the router must be reset to regain normal functionality.