PRESS RELEASE

Columbia, MD – April 16, 2012 -- Sourcefire, Inc. (Nasdaq: FIRE), a leader in intelligent cybersecurity solutions, today announced that its FirePOWER™ appliances protected against 99 percent of all attacks, according to recent NSS Labs independent IPS tests, exceeding Sourcefire’s previous industry record of 98 percent set in 2011. NSS Labs tested three appliances – the 8260, 8250 and 8120 – demonstrating consistency in security effectiveness, exceptional performance and scalability across Sourcefire’s Next-Generation Intrusion Prevention System (NGIPS) platform.

“For the past four years, Sourcefire has consistently achieved excellent results in security effectiveness based on our real-world evaluations of exploit evasions, threat block rate and protection capabilities,” said Vikram Phatak, CTO of NSS Labs. “The Sourcefire FirePOWER appliances also increased performance capacity over previous tests, making them a good choice for multi-gigabit environments.”

Security Effectiveness and Performance

All three FirePOWER appliances achieved 99 percent in overall detection and protection and the 8260 became one of the first IPS appliances tested at more than 30 Gbps for real world traffic inspection. Additional highlights according to NSS Labs product analysis:

Sourcefire 8260

● 34 Gbps of inspected throughput when measured against a real world mix of traffic

● Over 60M concurrent connections

● TCO less than $15 per Mbps protected

Sourcefire 8250

● 17 Gbps of inspected throughput when measured against a real world mix of traffic

● Over 30M concurrent connections

● TCO less than $19 per Mbps protected

Sourcefire 8120

● 3.4 Gbps of inspected throughput when measured against a real world mix of traffic

● Over 15M concurrent connections

● TCO $34 per Mbps protected

Based on FirePOWER technology, the 8260, 8250 and 8120 address enterprise requirements for flexible configurations, maximum protection, and faster processing of network data. FirePOWER acceleration technology provides market-leading performance with lower power consumption, allowing enterprises better threat detection and protection while maintaining a proven total cost of ownership (TCO). Demonstrated by product analysis reports, the FirePOWER appliances’ consistent and linear performance results make them a trusted solution for enterprise customers who need to scale their network security deployments with larger throughput models.

“NSS Labs test results further support what we have achieved for years – Sourcefire is the de facto standard for Next-Generation IPS,” said Martin Roesch, founder and CTO of Sourcefire. “We’ve proven that customers do not need to sacrifice security effectiveness, performance or TCO to secure their dynamic and growing networks.”

Individual Test Reports Available Now Sourcefire Individual Test Reports from NSS Labs on the 8260, 8250 and 8120 can be downloaded at http://www.sourcefire.com/NSSLabs

Webcast on May 9, 2012: Consistency in Security Effectiveness Join Bob Walder, Chief Research Officer at NSS Labs, and Jason Brvenik, from Sourcefire’s technology research group, as they discuss the importance of consistent security detection as well as scalable performance in an enterprise Next-Generation IPS deployment. Register: http://www.sourcefire.com/NSSLabs-Webinar

About NSS Labs, Inc.

NSS Labs, Inc. is the recognized leader in independent security research and testing. We provide subscription-based security intelligence to enterprises worldwide. Our test-based research and expert analyses provide information technology professionals with the unbiased data they need to select and maintain complex security products for their organizations. NSS Labs evaluates both network and endpoint security products, producing both individual Product Analysis Reports and group Comparative Analysis Reports. Group tests culminate in our exclusive Security Value Map™. Founded in 1991, the company is based in Austin, Texas. For more information, visit www.nsslabs.com.

About Sourcefire Sourcefire, Inc. (Nasdaq:FIRE), a world leader in intelligent cybersecurity solutions, is transforming the way global large- to mid-size organizations and government agencies manage and minimize network security risks. With solutions from a next-generation network security platform to advanced malware protection, Sourcefire provides customers with Agile SecurityTM that is as dynamic as the real world it protects and the attackers against which it defends. Trusted for more than 10 years, Sourcefire has been consistently recognized for its innovation and industry leadership with numerous patents, world-class research, and award-winning technology. Today, the name Sourcefire has grown synonymous with innovation, security intelligence and agile end-to-end security protection. For more information about Sourcefire, please visit www.sourcefire.com.

Sourcefire, the Sourcefire logo, Snort, the Snort and Pig logo, ClamAV, FireAMP, FirePOWER, FireSIGHT and certain other trademarks and logos are trademarks or registered trademarks of Sourcefire, Inc. in the United States and other countries. Other company, product and service names may be trademarks or service marks of others.