CVE-2006-3906 Denial of service in n/a
Remote attackers can cause denial of service on Cisco IOS, VPN 3000, and PIX firewalls by flooding IKE Phase-1 packets, exhausting resources.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2006-3906?
CVE-2006-3906 is a medium-severity denial of service vulnerability in Cisco Adaptive Security Appliance Software, published on 27 Jul 2006. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2006-3906?
It affects 21 products.
Products include Cisco Adaptive Security Appliance Software, Cisco Ios, Cisco Pix Asa Ids, Cisco Pix Firewall, Cisco Pix Firewall 501, Cisco Pix Firewall 506 and 15 more.
How do I fix CVE-2006-3906?
No fix has been published for CVE-2006-3906 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2006-3906 being exploited?
There is no known exploitation of CVE-2006-3906 in the wild and no public exploit code.
Other vulnerabilities in Cisco Adaptive Security Appliance Software
- CVE-2025-20333 Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow
- CVE-2016-6366 Cisco Adaptive Security Appliance (ASA) SNMP Buffer Overflow
- CVE-2026-20349 Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection
- CVE-2024-20353 Cisco ASA and FTD Denial of Service
- CVE-2016-6367 Cisco Adaptive Security Appliance (ASA) CLI Remote Code Execution
All Cisco Adaptive Security Appliance Software vulnerabilities
Sources
Also known as GHSA-v43w-r88q-4mh9.