The hacker, who called himself Fdf, posted , showing e-mail addresses of company employees and names, e-mail addresses, company affiliations and phone numbers of sales leads registered by the company's channel partners.

The attack started Saturday night and was launched at a time when the Barracuda Web Application Firewall that was supposed to protect the site had been taken offline for maintenance, Barracuda said Monday. After a couple of hours of probing, the hacker found an SQL injection flaw -- a common Web programming error -- on a script used to display write-ups of customer case studies. That one mistake got him into a database that the company used for its marketing program and sales lead development.

Barracuda does not store financial information in that database, the company said.

Although it's embarrassing when security companies get hacked, it happens a lot.

Last month EMC's RSA group said that someone had broken into its networks and obtained information that could compromise its SecurID products. In February security consultancy HBGary Federal was broken into, with tens of thousands of the company's e-mail messages posted online.