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…
- 7.5HighCVSS base score
- 2.4%Exploitation in 30 daysEPSS · top 16% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
Published
- 19 years later
· 19 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 2.0 | High7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
- EPSS (exploitation in 30 days)
- 2.4% · top 16% of all CVEs (10 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
n/a
- affected n/a
References
9
- ADV-2005-3008 (opens in a new tab)vdb-entryx_refsource_VUPENx_transferred
- 20051219 Authenticated EIGRP DoS / Information leak (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 15970 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- oval:org.mitre.oval:def:5741 (opens in a new tab)vdb-entrysignaturex_refsource_OVALx_transferred
- 20051220 Re: Unauthenticated EIGRP DoS (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 274 (opens in a new tab)third-party-advisoryx_refsource_SREASONx_transferred
- 20051220 RE: Authenticated EIGRP DoS / Information leak (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
- 1015382 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
- 20051219 Authenticated EIGRP DoS / Information leak (opens in a new tab)mailing-listx_refsource_FULLDISCx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2005-4432 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2005-4437)Record last updated .