CVE-2005-4436

High severity, CVSS 7.8. EPSS: 2.1% chance of exploitation in the next 30 days.

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 attackers 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).

Published 2005-12-21. Last modified 2026-06-16.