CVE-2006-3906
Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000...
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.
Exploit likelihood
What each source reports
NVD Score used
5.0
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.
- Record
CVE-2006-3906- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2006-3906- Updated
- 2026-11-02
EUVDEUVD-2006-3900 No score
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.
- Record
EUVD-2006-3900- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-v43w-r88q-4mh9 No score
Internet Key Exchange (IKE) version 1 protocol, as implemented on Cisco IOS, VPN 3000...
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.
- Record
GHSA-v43w-r88q-4mh9- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2006-3906 is a medium vulnerability (CVSS 5.0) in Cisco Ios, published July 27, 2006. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 6.87%, the 94th percentile. No source names a fixed version.
References
nta-monitor.com/posts/2006/07/cisco-concentrator-dos.html
securityfocus.com/bid/19176
securityfocus.com/archive/1/441203/100/0/threaded
osvdb.org/29068
archives.neohapsis.com/archives/bugtraq/2006-07/0531.html
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5299