Snort, the open-source intrusion-detection software, <A HREF="http://news.zdnet.com/2100-1009_22-6160966.html?tag=nl.e550">is vulnerable to hackers,</A> its developers said this week. Sourcefire, the company behind Snort, said that hackers could potentially execute malicious code on a system running Snort and gain access to confidential data. The vulnerability was reported to Sourcefire by Internet Security Systems, the security arm of IBM.