Internet Security Systems Positioned in the Leader Quadrant in Analyst Research Firm’s Network Intrusion Prevention System Magic Quadrant

LONDON — December 7, 2005 — Internet Security Systems (ISS) (NASDAQ: ISSX) today announced that technology research firm, Gartner, Inc., has positioned the company in the leader quadrant of the Magic Quadrant* for Network Intrusion Prevention System Appliances, 2H05. Placement in the leader quadrant is based on the completeness of vision in the intrusion prevention system (IPS) space and the ability to execute on that vision.

The Gartner Magic Quadrant is a graphical portrayal of vendor performance in a market segment, including categories for leaders, challengers, visionaries and niche players. According to Gartner, the network IPS market for stand-alone appliances will increase to more than $400 million by the end of 2005. As stated in the Magic Quadrant, vendors in the leader quadrant for this space “raise the competitive bar for all products in the market, and they can change the course of the industry.” Additionally, leaders “produce products that provide high signature quality, offer low latency and have a range of models.”

“We believe our position in Gartner’s network IPS Magic Quadrant is confirmation of our leadership in a market that we pioneered, beginning with the development of our first intrusion detection system and evolving into today’s advanced intrusion prevention technologies,” said Thomas Noonan, president and CEO of Internet Security Systems. “Our Proventia Network Intrusion Prevention System is designed to protect organisations from exploitation even before vulnerabilities and dangerous exploits are known. This “ahead of the threat’ approach truly allows ISS customers to prevent Internet threats from impacting the performance of their networks.”

The Proventia® Network IPS product offers transparent, in-line network protection that pre emptively blocks Internet attacks, protects customers’ mission-critical assets and keeps networks up and running. The technology is powered by the unique, in-depth vulnerability intelligence of ISS’ X-Force® research and development team. Proventia Network IPS can be easily managed and seamlessly integrated with additional ISS security products through ISS’ Proventia Management SiteProtector. These features embody ISS’ vision for enterprise information security; delivering protection that is tightly integrated with existing IT operations to protect organisations before a threat can even enter the network.

For additional information on Proventia Network IPS, please visit:

http://www.iss.net/products_services/enterprise_protection/proventia/g_series.php

About Internet Security Systems, Inc.

Internet Security Systems, Inc. (ISS) is the trusted expert to global enterprises and world governments, providing products and services that protect against Internet threats. An established world leader in security since 1994, ISS delivers proven cost efficiencies and reduces regulatory and business risk across the enterprise. ISS products and services are based on the proactive security intelligence conducted by ISS’ X-Force® research and development team the unequivocal world authority in vulnerability and threat research. Headquartered in Atlanta, Internet Security Systems has additional operations throughout the Americas, Asia, Australia, Europe and the Middle East. For more information, visit the Internet Security Systems website at www.iss.net or call +44(0)1753 845 100.

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