Extended Interior Gateway Routing Protocol (EIGRP) 1.2, as implemented in Cisco IOS after 12.3(2), 12.3(3)B, and 12.3(2)T and other products, allows remote malicious users to cause a denial of service by sending a "spoofed neighbor announcement" with (1) mismatched k values or (2) "goodbye message" Type-Length-Value (TLV).
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