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CVE-2005-4437

HIGH

7.5

CVSS Severity Score

EPSS Score0.0750%

EPSS Percentile41.14th

PublishedDec 21, 2005

Last ModifiedApr 16, 2026

Vulnerability Description

MD5 Neighbor Authentication in Extended Interior Gateway Routing Protocol (EIGRP) 1.2, as implemented in Cisco IOS 11.3 and later, does not include the Message Authentication Code (MAC) in the checksum, which allows remote attackers to sniff message hashes and (1) replay EIGRP HELLO messages or (2) cause a denial of service by sending a large number of spoofed EIGRP neighbor announcements, which results in an ARP storm on the local network.

Affected Platforms (CPE)

📦

Extended Interior Gateway Routing Protocol

Extended Interior Gateway Routing Protocol

= 1.2

References & Advisories

🔗 http://lists.grok.org.uk/pipermail/full-disclosure/2005-December/040332.html

🔗 http://marc.info/?l=full-disclosure&m=113504451523186&w=2

🔗 http://securityreason.com/securityalert/274

🔗 http://securitytracker.com/id?1015382

🔗 http://www.securityfocus.com/archive/1/419830/100/0/threaded

🔗 http://www.securityfocus.com/archive/1/419898/100/0/threaded

🔗 http://www.securityfocus.com/bid/15970

🔗 http://www.vupen.com/english/advisories/2005/3008

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