PRESS RELEASE

BOXBOROUGH, Mass. - December 17, 2008 - Crossbeam Systems, Inc., the leading provider of next-generation security platforms for high-performance networks, today announced that the latest version of the Sourcefire 3D System from Sourcefire (NASDAQ:FIRE), comprising the Sourcefire 3D Sensor and Real-Time Network Awareness (RNA) powered by open source SNORT, is now available on its X-Series Next Generation Security Platform. The Sourcefire 3D System 4.8 delivers the industry's first adaptive intrusion prevention capabilities to secure large enterprise network assets against all forms of security threats.

"Through Crossbeam's iBeam ISV certification program, the Sourcefire 3D System 4.8 has been proven to provide the strongest levels of protection, while working at optimum performance levels on the X-Series in customer environments," said Chet Gapinski, vice president of engineering for Crossbeam. "Customers can now easily combine a best-of-breed firewall from Checkpoint and a best-of-breed IPS from Sourcefire in a serialized environment, creating a true next-generation firewall solution."

Crossbeam enables customers to consolidate their security infrastructure on a carrier-class scalable security platform that virtualizes the delivery of best-of-breed security applications. The X-Series is the highest-performing security platform, tested to wire-line rates of 40 gigabytes per second (Gbps) with ultra-low latency, providing unprecedented levels of scale and flexibility to support the security requirements of large enterprise and carrier networks. Customers use the X-Series to protect their internal networks and deliver a new generation of virtualized services such as firewall, VPN and intrusion prevention, while reducing the cost and complexity of security services deployment within their data centers.

Sourcefire RNA allows users to reduce the overall resources dedicated to managing and monitoring IPS deployments. Not only does RNA dramatically decrease the number of false positives, but the RNA Recommended Rules feature reduces tuning by suggesting the rules best suited to protect a customer's specific environment. Unlike competitors, the Sourcefire IPS can use RNA information about a host to model traffic to the specific operating system being attacked. This provides customers more accurate prevention and an increased ability to stop evasions.

"The combination of the Sourcefire 3D System 4.8 and the high-performance Crossbeam platform simplifies the deployment of multiple best-of-breed security devices and provides customers with leading protection for their fastest networks," said Michele Perry, chief marketing officer at Sourcefire. "By becoming iBeam-certified, we are providing Crossbeam customers with the confidence they will receive the leading performance and reliability that Sourcefire customers have come to expect."

Crossbeam's iBeam ISV certification program rigorously tests best-of-breed security applications running on the X-Series in real-world environments by recreating the layered, core security architectures of large enterprise and service provider networks. This assures customers deploying the Sourcefire 3D System 4.8 on the Crossbeam chassis that this solution will provide the carrier-class performance and reliability they demand in their networks.

About Sourcefire 3D System

The Sourcefire 3D System gives organizations the ability to more confidently protect their networks. As the industry's only adaptive IPS, the 3D System enables customers to optimize the security and performance of their IPS systems based on the actual network assets they are protecting. This provides customers the ability to increase security while reducing management overhead.

Powered by open source Snort as its detection engine, the Sourcefire 3D System is consistently recognized as one of the industry's leading and most innovative IPSs. Backed by the VRT, a group of leading edge intrusion detection and prevention experts and a community of over 210,000 active Snort users, the Sourcefire 3D System helps to protect customers from critical threats, often before they are formally discovered.

About Crossbeam Crossbeam Systems, Inc. transforms the way enterprises, service providers and government agencies architect and deliver security services. The basis of Crossbeam's solution is its Next Generation Security Platform, a highly scalable software and hardware platform that facilitates the consolidation, virtualization and simplification of security services delivery, while preserving the customers' choice of best-of-breed security applications. Crossbeam offers the only security platform that delivers unparalleled network performance, scalability, adaptability and resiliency. Customers choose Crossbeam to intelligently manage risk, accelerate and maintain compliance, and protect their businesses from evolving threats. Crossbeam is headquartered in Boxborough, Mass., and has offices in Europe, Asia Pacific and Latin America. More information is available at: www.crossbeam.com.