Sourcefire Acquires ClamAV Open Source Network Anti-Virus Project

Acquisition Expands Companys Open Source Portfolio and Commercial Enterprise Threat Management Strategy

COLUMBIA, Md.--(BUSINESS WIRE)--Open source innovator and SNORT ® creator, Sourcefire, Inc. (Nasdaq:FIRE), today announced that it has acquired ClamAV, a leading open source gateway anti-virus and anti-malware project. Sourcefires first acquisition since its Initial Public Offering in March 2007, ClamAV will broaden the companys open source footprint while providing the technology foundation for new products and services that will extend the companys Enterprise Threat Management network security portfolio.

“We are very excited to join Sourcefire and we believe that this combination will allow us to deliver increased value to the open source community, as well as Sourcefire’s commercial customers”

With nearly 1 million unique IP addresses downloading ClamAV malware updates daily across more than 120 mirrors in 38 countries, ClamAV is one of the most broadly adopted open source security projects worldwide. ClamAV has also been recognized as comparable in quality and coverage to leading commercial anti-virus solutions. Most recently, at LinuxWorld this year, ClamAV was one of only three anti-virus technologies to provide a 100% detection rate in their live Fight Club test featuring live submissions from the show audience.

Under terms of the transaction, Sourcefire has acquired the ClamAV project and related trademarks, as well as the copyrights held by the five principal members of the ClamAV team including project founder Tomasz Kojm. Sourcefire will also assume control of the open source ClamAV project including the ClamAV.org domain, web site and web site content and the ClamAV Sourceforge project page. In addition, the ClamAV team will remain dedicated to the project as Sourcefire employees, continuing their management of the project on a day-to-day basis.

In accounting for the transaction, Sourcefire anticipates a one-time charge in the third quarter of 2007 of between $0.09 and $0.12 per share for the immediate write-off of in-process research and development, which will be classified as an extraordinary item. Details of the transaction consideration are not being disclosed.

This acquisition gives Sourcefire the ability to bring together two of the security industrys most widely adopted open source projects; Snort and ClamAV. This will not only broaden our reach, but will also allow us to extend our product family into a number of intriguing new markets, said Martin Roesch, Founder and CTO of Sourcefire and Creator of Snort. The success of the ClamAV project is a direct reflection of the talent and dedication of the founding team and the project community. Sourcefire will continue to invest in the ClamAV technology, much as we have with Snort and Snort.org. Sourcefire pioneered the business of balancing commercial solutions with open source innovation, and we intend to apply those same Snort sensibilities to the ClamAV project.

ClamAV has been adopted by network security solution and service providers worldwide and is currently integrated within leading enterprise solutions, including Unified Threat Management Systems (UTM), Secure Web Gateways and Secure Mail Gateways, to identify deeply embedded threats such as viruses, trojans, spyware, and other forms of malware.

We are very excited to join Sourcefire and we believe that this combination will allow us to deliver increased value to the open source community, as well as Sourcefires commercial customers, said Tomasz Kojm, ClamAV Project Founder. Sourcefire is a well respected company in the open source arena, and they really understand how to balance open source community investment with the commercial needs of their customers. This is an exciting development for me, as the project founder, and I look forward to the future growth of the ClamAV technology and community.

Conference Call and Webcast

On Friday, August 17, 2007 at 11:00 a.m. Eastern Time, Sourcefire will host a conference call to review this announcement. A listen-only web cast of the session will be available at http://investor.sourcefire.com. Those wishing to participate in the live session should use the following numbers to dial in:

Calling from the United States or Canada: 866-831-6270
Calling from other countries: 617-213-8858
Pass code: 19013275

An online replay will be available at http://investor.sourcefire.com following the completion of the live call and will remain available for at least 90 days.

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. The Sourcefire 3D System is the first to unify IPS, NBA, NAC and Vulnerability Assessment technologies under the same management console. This ETM approach equips customers with an efficient and effective layered security defense protecting network assets before, during and after an attack. Through the years, Sourcefire has been consistently recognized for its innovation and industry leadership by customers, media and industry analysts alike with more than 30 awards and accolades. Recently, Sourcefire was positioned in the Leaders Quadrant of Gartners Magic Quadrant for Network Intrusion Prevention System Appliances 2H06 report, and the Sourcefire 3D System was named Best Security Solution at the 2006 SC Magazine Awards. Today, 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®, SNORT®, the Sourcefire logo, the Snort and Pig logo, SECURITY FOR THE REAL WORLD, SOURCEFIRE DEFENSE CENTER, SOURCEFIRE 3D, RNA, DAEMONLOGGER and certain other trademarks and logos are trademarks or registered trademarks of Sourcefire, Inc. in the United States and other countries.

Cautionary Language Concerning Forward-Looking Statements

The statements contained in this release that are not historical facts are forward-looking statements (as such term is defined in the Private Securities Litigation Reform Act of 1995) that involve risks and uncertainties. These statements, which can be identified by words or expressions such as will, believe, expect, anticipate, intend and similar expressions, include our expectations regarding Sourcefires offering of ClamAV as an open source solution, its integration of ClamAV into Sourcefires commercial ETM offerings, the future roles and performance of the ClamAV personnel as Sourcefire employees, the amount of the accounting charge expected to be incurred in connection with the write-off of in-process research and development as a result of the transaction and Sourcefires intention to invest in the ClamAV technology. Actual results, performance, and/or achievements of Sourcefire, Inc. may differ materially from the future results, performance, and/or achievements expressed or implied by these forward-looking statements. Management cautions the reader that these forward-looking statements are only predictions and are subject to a number of both known and unknown risks and uncertainties, including Sourcefires ability to integrate ClamAV into its existing ETM commercial offerings, the continued employment by Sourcefire of the ClamAV personnel, the final allocation of the purchase price of the transaction, Sourcefires future budgetary decisions, and other factors, including without limitation, those risks and uncertainties described in the Risk Factors section of Sourcefires Form 10-Q for the quarter ended June 30, 2007 and other reports filed from time to time by Sourcefire with the Securities and Exchange Commission. Sourcefire undertakes no obligation to update any forward-looking statements.

Contacts

Sourcefire, Inc.
Investor Contact:
Tania Almond
Investor Relations Officer
410-423-1919
tania.almond@sourcefire.com
or
Media Contact:
Welz & Weisel Communications
Tony Welz
Principal
703-218-3555 x226
tony@w2comm.com

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