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Cisco Gear Subject to DoS Attack

Cisco Systems on Friday warned that a denial of service (DoS) vulnerability exists for its products.

The threat affects all Cisco products running the vendor's Internetwork Operating System (IOS). A DoS attack can be triggered if a hacker crafts a malicious TCP connection to a Telnet or reverse Telnet port of a Cisco device running IOS, according to a security advisory issued by Cisco, San Jose, Calif.

Telnet is a common way to control Web servers remotely.

If the vulnerability is exploited, network-based management connections to IOS-based Cisco routers could be blocked. However, data traffic through the routers would continue to flow.

Cisco is offering free software and technical workarounds at its Web site.

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