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IOS is the firmware designed for Cisco routers. IOS is a router specific firmware designed to allow networkers the ability to configure and control Cisco routers. A problem in IOS can allow remote users to crash Cisco routers. Upon receiving an unrecognized transitive attribute in a BGP UPDATE message, this can cause a Cisco router using an affected version of IOS to crash. This problem makes it possible for a remote user to crash Cisco routers using BGP, and deny service to legitimate users.

IOS is the firmware designed for Cisco routers. IOS is a router specific firmware designed to allow networkers the ability to configure and control Cisco routers. A problem in IOS can allow remote users to crash Cisco routers. Upon receiving an unrecognized transitive attribute in a BGP UPDATE message, this can cause a Cisco router using an affected version of IOS to crash. This problem makes it possible for a remote user to crash Cisco routers using BGP, and deny service to legitimate users.