The Internet Assigned Numbers Authority (IANA) has issued warnings about a dangerous vulnerability affecting DNS servers. This is a form of cache poisoning where the vulnerable server is made to provide wrong data.
IANA has released an on-line tool to test if the domain servers for your domain is vulnerable. You can find it at
This is not something to ignore. Many of you with self managed dedicated and VPS web servers are going to find that your DNS servers are vulnerable!
Please check all your domain names today and take measures to fix the problem, if any. More details are available at the IANA website FAQ and the US Computer Emergency Response Team (CERT) vulnerability note VU#800113.
