CVE-2011-0393 Denial of service in n/a

High 7.8 Published 25 Feb 2011 Updated 6 Aug 2024

Remote attackers can cause denial of service on Cisco ASA devices via IPv6 traffic when transparent firewall mode is enabled without IPv6 configuration.

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-2011-0393?

CVE-2011-0393 is a high-severity denial of service vulnerability in Cisco 5500 Series Adaptive Security Appliance, published on 25 Feb 2011. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Cisco Adaptive Security Appliances (ASA) 5500 series devices with software 7.0 before 7.0(8.12), 7.1 and 7.2 before 7.2(5.2), 8.0 before 8.0(5.21), 8.1 before 8.1(2.49), 8.2 before 8.2(3.6), and 8.3 before 8.3(2.7) and Cisco PIX Security Appliances 500 series devices, when transparent firewall mode is configured but IPv6 is not configured, allow remote attackers to cause a denial of service (packet buffer exhaustion and device outage) via IPv6 traffic, aka Bug ID CSCtj04707.

Weakness: CWE-399

Which versions are affected by CVE-2011-0393?

It affects 4 products.

Products include Cisco 5500 Series Adaptive Security Appliance, Cisco Adaptive Security Appliance Software, Cisco Asa 5500, Cisco Pix 500.

How do I fix CVE-2011-0393?

No fix has been published for CVE-2011-0393 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-2011-0393 being exploited?

There is no known exploitation of CVE-2011-0393 in the wild and no public exploit code.

All Cisco 5500 Series Adaptive Security Appliance vulnerabilities

Sources

Also known as GHSA-236r-q498-mcw6.