CVE-2006-4430
The Cisco Network Admission Control (NAC) 3.6.4.1 and earlier allows remote attackers to prevent installation of the Cisco Clean Access…
- 5.0MediumCVSS base score
- 2.0%Exploitation in 30 daysEPSS · top 19% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
The Cisco Network Admission Control (NAC) 3.6.4.1 and earlier allows remote attackers to prevent installation of the Cisco Clean Access (CCA) Agent and bypass local and remote protection mechanisms by modifying (1) the HTTP User-Agent header or (2) the behavior of the TCP/IP stack. NOTE: the vendor has disputed the severity of this issue, stating that users cannot bypass authentication mechanisms.
Timeline
ID reserved
By mitre
- 1 day later
· 1 day later
Published
- 18 years later
· 18 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 | Medium5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
- EPSS (exploitation in 30 days)
- 2.0% · top 19% of all CVEs (11 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.0.
Affected products
n/a
- affected n/a
References
References8
- 20050822 RE: Cisco Clean Access Agent (Perfigo) bypass (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 19726 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 20060829 Re: Cisco NAC Appliance Agent Installation Bypass Vulnerability (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20060822 Response to BugTraq - Cisco Clean Access Agent (Perfigo) Bypass (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
- 20050819 Cisco Clean Access Agent (Perfigo) bypass (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20060826 NAC Agent Installation Bypass (opens in a new tab)vendor-advisoryx_refsource_CISCOx_transferred
- 20060826 Re: Cisco NAC Appliance Agent Installation Bypass Vulnerability (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- 20060826 Cisco NAC Appliance Agent Installation Bypass Vulnerability (opens in a new tab)mailing-listx_refsource_BUGTRAQx_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-2006-4418 (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-2006-4430)Record last updated .