PRESS RELEASE

COLUMBIA, Md., December 4, 2008 - Open source innovator and SNORT(r) creator, Sourcefire, Inc. (Nasdaq:FIRE), a leader in Enterprise Threat Management, today announced that solar powered hosting company, Affordable Internet Services Online, Inc. (AISO.Net), is using the Sourcefire 3D System to protect its completely virtualized data center and customer Web sites from attack.

"Because AISO.Net is on the cutting edge of green IT and virtualization, we required a security vendor that can keep up with this innovation," said Phil Nail, Chief Executive Officer of AISO.Net. "With customers throughout the Fortune 500, AISO.Net is a trusted partner with a reputation for providing top-shelf reliability, performance and customer satisfaction. Sourcefire provides us with the perfect combination of power and simplicity, delivering effective and efficient protection against the latest threats."

Using the latest green design techniques, AISO.Net built its data center, network and servers to use the lowest amount of energy possible. By generating electricity thru the use of solar panels, AISO.Net is able to produce the energy needed to operate its data center without polluting the environment. Its solar panels power its green data center and offices, unlike other companies that use energy credits to offset the power costs for servers and/or office space. As a result, AISO.Net estimates that its Power Usage Effectiveness (PUE) score is 1, the lowest possible score for measuring energy efficiency.

"With an innovative data center and Fortune 500 customer base, AISO.Net selected the Sourcefire 3D System to defend its systems and customers against potential threats," said Tom McDonough, President and COO at Sourcefire. "The 3D System provides AISO.Net with the power, flexibility and proactive protection to secure all of its virtualized systems. This is critical as AISO.Net works to maximize customer satisfaction and web site uptime."

About AISO.Net Based in Southern California, AISO.Net has been a trusted name in environmentally friendly Web hosting since 1997, providing a level of service that is unmatched in the industry. All network and server hardware is fully redundant with 24x7-automated systems monitoring to ensure the highest possible uptime. Using solar panels to power its data center and network, AISO.Net is the first and only 100% completely solar powered Web hosting company. Customers as far away as Kenya, East Africa rely on the service and reliability offered by AISO.Net. www.aiso.net About Sourcefire Sourcefire, Inc. (Nasdaq: FIRE), Snort creator and open source innovator, is a world leader in Enterprise Threat Management (ETM) solutions. Sourcefire is transforming the way Global 2000 organizations and government agencies manage and minimize network security risks with its 3D Approach - Discover, Determine, Defend - to securing real networks. This ETM approach equips customers with an efficient and effective layered security defense - protecting network assets before, during and after an attack. The names Sourcefire and founder Martin Roesch have grown synonymous with innovation and network security intelligence. For more information about Sourcefire, please visit http://www.sourcefire.com. SOURCEFIRE(r), SNORT(r), the Sourcefire logo, the Snort and Pig logo, SECURITY FOR THE REAL WORLD(tm), SOURCEFIRE DEFENSE CENTER(tm), SOURCEFIRE 3D(r), RNA(tm), DAEMONLOGGER(tm), CLAMAV(r), SOURCEFIRE SOLUTIONS NETWORK(tm), 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.