Is my network secure? Are there holes in our security? If you're directly or indirectly responsible for maintaining computers connected to the Internet, those are questions you've probably asked yourself from time to time. Unfortunately, certain answers are difficult to come by, considering the rapid rate at which networks and operating systems are evolving and the staggering complexity of some of the software involved. Any resource that can bring you closer to that certainty is worth a look. CyberNotes, maintained by the National Infrastructure Protection Center (NIPC), is one of the wide array of useful security resources available. Given their mandate "to detect, deter, assess, warn of, respond to, and investigate computer intrusions and unlawful acts," NIPC is obviously concerned with tracking and alerting system administrators to potential security holes, and CyberNotes is one of their primary tools to achieve that goal. CyberNotes features an appropriately detailed list of recently discovered bugs and security holes, including the software involved, information about potential patches or workarounds, and a rating indicating the severity of the problem. The newsletter's "Trends" section discusses specific trends in attack techniques and origination points and security vulnerabilities that have recently been in frequent use by intruders. In general, CyberNotes can be a very valuable tool if hands-on computer security is part of your job, and it's worth browsing if you are indirectly involved in any fashion with the maintenance of networked computers.