Internet Security Systems Affirms Technology Leadership Credentials With Frost & Sullivan Award

LONDON----Aug. 3, 2005--Internet Security Systems Inc. (NASDAQ:ISSX) is the recipient of Frost & Sullivan's 2005 Technology Leadership Award for its wide-ranging and innovative line of endpoint security products. Employing a unique approach, Internet Security Systems (ISS) uses a combination of different technologies that work seamlessly and effectively to stop threats at the endpoint.

The company's comprehensive approach to endpoint security includes protection against network-based attacks, which use malicious network traffic to remotely compromise their target systems, as well as application-based attacks, which use executable files to attack target systems. ISS' pioneering multi-layered protection solution works to prevent both application and network borne attacks.

"To check network attacks, ISS deploys a combination of personal firewall, intrusion prevention systems and buffer overflow exploit prevention or memory protection," notes Frost & Sullivan Senior Industry Analyst Jose Lopez. "To avert application attacks, ISS uses a combination of virus prevention systems or prevention from unknown virus attacks and application control, which protects hosts from threats before or during the launch phase of an attack."

Through its Proventia(R) Enterprise Security Platform (ESP), a fully integrated suite of security tools, Internet Security Systems delivers pre-emptive protection -- keeping customers ahead of the next online threat more effectively and more affordably than conventional security methods. In addition, ISS' products and services are backed by the world-renowned X-Force(R) research and development team and 24/7 global attack monitoring.

"Frost & Sullivan believes that despite tough competition, ISS' approach makes the company a technology leader. By innovating leading-edge concepts, the company has pioneered client applications, making it a deserving recipient of the Technology Leadership Award for endpoint security," concludes Lopez.

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 Web site at www.iss.net or call .

About Frost & Sullivan

Frost & Sullivan, a global growth consulting company, has been partnering with clients to support the development of innovative strategies for more than 40 years. The company's industry expertise integrates growth consulting, growth partnership services and corporate management training to identify and develop opportunities. Frost & Sullivan serves an extensive clientele that includes Global 1000 companies, emerging companies and the investment community by providing comprehensive industry coverage that reflects a unique global perspective and combines ongoing analysis of markets, technologies, econometrics and demographics. For more information, visit http://www.frost.com.