MD5 Neighbor Authentication in Extended Interior Gateway Routing Protocol (EIGRP) 1.2, as…
Priority LOW 37Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Partial · Partial · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA.
Summary
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.
Why it matters now
EPSS 0.02388 84th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:extended_interior_gateway_routing_protocol:extended_interior_gateway_routing_protocol:1.2:*:*:*:*:*:*:* | 1.2 | Vulnerable | Extended Interior Gateway Routing Protocol |
- cpe:2.3:a:extended_interior_gateway_routing_protocol:extended_interior_gateway_routing_protocol:1.2:*:*:*:*:*:*:* Versions 1.2 Vulnerable ·Extended Interior Gateway Routing Protocol
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2005-4437
- 2026-10-03 Alias added: GHSA-8fqx-vvx3-hvxm
References
More Extended Interior Gateway Routing Protocol vulnerabilities
- TI-2002-02120 Extended Interior Gateway Routing Protocol (EIGRP), as implemented in Cisco IOS 11.3… CVSS 2.0HIGH 7.8
Sources
- CVE-2005-4437 · CVE Program
- CVE-2005-4437 · NVD
- FIRST EPSS
- GHSA-8fqx-vvx3-hvxm · GitHub Advisory Database · CC BY 4.0
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