SOURCEFIRE NAMED A “RED HERRING 100 AWARD” WINNER

Innovative Security Company Selected based on Revenue, Customer and Partner Momentum

Columbia, MD., May 13, 2004 - Sourcefire, Inc., a world leader in intelligent network defense, today announced that it has been named a Red Herring 100 company. Sourcefire was chosen for its ability to generate strong revenue, establish a strong customer base and develop strategic partnerships.

" At the Red Herring, we scour the industry to identify the best and brightest technology companies that are transforming the current markets and creating new ones," said Alex Vieux, Red Herring publisher. "The Red Herring 100 is our annual list of the most promising private companies. Like Google, eBay, Salesforce.com, and other previous Red Herring 100 alumni, these 100 have the potential to become the next titans of technology."

Sourcefire was selected to the 2004 Red Herring Top 100 following the evaluation of more than 500 private companies by Red Herring’s editors. Each Red Herring 100 winner is selected based upon its ability to make a lasting impact on the industry. This year´s selection process was weighted to reflect the reality of survival in today's challenging marketplace: generating revenues, establishing a strong customer base and equally strong industry partnerships.

“ Sourcefire is dedicated to delivering security solutions that address real-world needs, and we are excited that the Red Herring editors recognize the value and innovation that we provide to our customers,” said Wayne Jackson, CEO of Sourcefire. “Sourcefire’s innovative security technology, including our new Real-time Network Awareness system, provides companies with the ability to identify threats and vulnerabilities before they are exploited. This significantly reduces our customers’ security risks and helps ensure business continuity even when new threats are identified or attacks are launched."

The Red Herring editorial team rigorously evaluates each company by a careful analysis of financial data and subjective criteria, including quality of management, execution of strategy, and dedication to research and development. Past Red Herring 100 alumni include eBay, Google, Salesforce.com, Plumtree Software and Seagate Technology.

About Sourcefire’s Real-time Security Products
Sourcefire’s Intelligent Security Monitoring system (ISM), including Sourcefire Network Sensors, Real-time Network Awareness, ISM Agent for Snort and Management Console delivers increased network visibility and state of the art security monitoring for immediate threat detection, mitigation and response, which enables customers to effectively prevent intrusions and other threats to network assets.

Sourcefire’s Intelligent Security Monitoring products form the security industry’s only unified solution to combine state-of-the-art network surveillance, policy enforcement and attack remediation. Sourcefire’s flexible, scalable and precise intrusion detection technologies are the most widely deployed worldwide. Sourcefire’s RNA solution passively monitors a network to deliver highly detailed, real-time profiles of all network assets including their configuration, behavior, potential vulnerabilities and associated changes. In addition, Sourcefire Management Console, a complete enterprise security management solution with an integrated ultra-high performance database, provides an extraordinary platform for managing, analyzing, and acting on the network surveillance information generated by IDS and RNA sensors.

All products have the backing of Sourcefire’s highly regarded Vulnerability Research Team and the support of expert 24x7 customer services.

About Sourcefire, Inc.
Sourcefire, Inc., a world leader in intelligent security monitoring and threat management solutions, has been recognized throughout the industry for enabling customers to quickly and effectively minimize network security risks. The Sourcefire Intelligent Security Monitoring system is the first ever unified security monitoring infrastructure delivering all of the capabilities needed to proactively identify threats and defend against intruders. Founded in 2001 by the creators of Snort™, Sourcefire is a privately held company headquartered in Columbia, MD. For more information about Sourcefire, please visit www.sourcefire.com.