CVE-2006-3906
Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000 Concentrators, and PIX firewalls, allows remote attackers to cause a denial of service (resource exhaustion) via a flood of IKE Phase-1 packets that exceed the session expiration rate. NOTE: it has been argued that this is due to a design weakness of the IKE version 1 protocol, in which case other vendors and implementations would also be affected.
Key facts
- CVSS score
- 5.0 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P- EPSS score
- 6.9% (94th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2006-3900)
- Published
- July 27, 2006
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2006-3900 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / adaptive security appliance software
- cisco / ios
- cisco / pix asa ids
- cisco / pix firewall
- cisco / pix firewall
- cisco / pix firewall
- cisco / pix firewall
- cisco / pix firewall 501
- cisco / pix firewall 506
- cisco / pix firewall 515
- cisco / pix firewall 515e
- cisco / pix firewall 520
- cisco / pix firewall 525
- cisco / pix firewall 535
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
- cisco / pix firewall software
and 88 more…
References
- http://archives.neohapsis.com/archives/bugtraq/2006-07/0531.html
- http://securityreason.com/securityalert/1293
- http://securitytracker.com/id?1016582
- http://www.cisco.com/en/US/tech/tk583/tk372/tsd_technology_security_response09186a00806f33d4.html
- http://www.nta-monitor.com/posts/2006/07/cisco-concentrator-dos.html
- http://www.osvdb.org/29068
- http://www.securityfocus.com/archive/1/441203/100/0/threaded
- http://www.securityfocus.com/bid/19176
- https://exchange.xforce.ibmcloud.com/vulnerabilities/27972
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5299
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
Query CVEs from your AI assistant
The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.
Add the CVE brain