Users have been advised of a problem in the way Cisco's
Internetwork Operating System handles connections to the telnet
networking application used to manage devices
remotely.
A specifically crafted transmission control protocol connection to
a telnet or reverse telnet port of a Cisco device running IOS may
block further telnet, reverse telnet, remote shell, secure shell
and, in some cases, HTTP access to the Cisco device.
The company said other device services will operate normally.
Services, such as packet forwarding, and all other communication to
and through the device are not affected.
Cisco will release fixes for this vulnerability in all currently
maintained IOS releases.
