How severe is CVE-2005-4437?

CVE-2005-4437 has a CVSS 2.0 base score of 7.5, rated high severity.

Is CVE-2005-4437 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2005-4437?

CVE-2005-4437 affects Extended Interior Gateway Routing Protocol. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2005-4437?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2005-4437 published?

CVE-2005-4437 was published on 2005-12-21 and last updated on 2026-06-16.

CVE-2005-4437

CVE-2005-4437 is a high-severity vulnerability in Extended Interior Gateway Routing Protocol with a CVSS 2.0 base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 2.0 base score 7.5)
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Extended Interior Gateway Routing Protocol
Published: 2005-12-21
Last modified: 2026-06-16

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.

Frequently asked questions

What is CVE-2005-4437?: 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.
How severe is CVE-2005-4437?: CVE-2005-4437 has a CVSS 2.0 base score of 7.5, rated high severity.
Is CVE-2005-4437 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2005-4437?: CVE-2005-4437 affects Extended Interior Gateway Routing Protocol. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2005-4437?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2005-4437 published?: CVE-2005-4437 was published on 2005-12-21 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:extended_interior_gateway_routing_protocol:extended_interior_gateway_routing_protocol:1.2:*:*:*:*:*:*:*

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