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CVE-2005-4437 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

No CVSS 3.x data is available for this CVE.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
http://lists.grok.org.uk/pipermail/full-disclosure/2005-December/040332.html	CVE	Vendor Advisory
http://marc.info/?l=full-disclosure&m=113504451523186&w=2	CVE
http://securityreason.com/securityalert/274	CVE
http://securitytracker.com/id?1015382	CVE
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5741	CVE
http://www.securityfocus.com/archive/1/419830/100/0/threaded	CVE
http://www.securityfocus.com/archive/1/419898/100/0/threaded	CVE
http://www.securityfocus.com/bid/15970	CVE
http://www.vupen.com/english/advisories/2005/3008	CVE
http://lists.grok.org.uk/pipermail/full-disclosure/2005-December/040332.html	[email protected]	Vendor Advisory
http://marc.info/?l=full-disclosure&m=113504451523186&w=2	[email protected]
http://securityreason.com/securityalert/274	[email protected]
http://securitytracker.com/id?1015382	[email protected]
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5741	[email protected]
http://www.securityfocus.com/archive/1/419830/100/0/threaded	[email protected]
http://www.securityfocus.com/archive/1/419898/100/0/threaded	[email protected]
http://www.securityfocus.com/bid/15970	[email protected]
http://www.vupen.com/english/advisories/2005/3008	[email protected]

see all 18 references

Weakness Enumeration

CWE-ID	CWE Name	Source
NVD-CWE-Other	Weakness Not in a Standard CWE Category	[email protected]

Affected Products

Product	Versions
extended interior gateway routing protocol extended interior gateway routing protocol	1.2
CPE cpe:2.3:a:extended_interior_gateway_routing_protocol:extended_interior_gateway_routing_protocol:1.2:::::::* Remediation No remediation found in references.

Change History

8 change records found show changes

Date	Action	Recorded By
Jun 16, 2026	CVE Modified	[email protected]
Apr 16, 2026		[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Oct 19, 2018	CVE Modified	[email protected]
Oct 11, 2017	CVE Modified	[email protected]
Oct 18, 2016	CVE Modified	[email protected]
Dec 21, 2005	Initial Analysis	[email protected]