Citrix NetScaler Application Firewall Passes Rigorous ICSA Labs Premier Services Certification for Web Application Security.

FORT LAUDERDALE, Fla. -- Citrix Systems, Inc. (Nasdaq:CTXS), the global leader in access infrastructure solutions, today announced that ICSA Labs, an independent division of Cybertrust, Inc., has certified the Citrix(R) NetScaler(R) Application Firewall for passing a rigorous set of functional, performance, and platform security requirements as part of the ICSA Labs Premier Services criteria for Web application security.

Specifically, ICSA Labs certified that the Citrix NetScaler Application Firewall utilizes a positive security model rejecting all traffic that is not known to be good, reducing the possibility of data theft, credit card theft and identity theft. The NetScaler Application Firewall also cloaks internal application structures, offers advanced SSL support, and, most importantly, detects and prevents against entire classes of Web application attacks, including (but not limited to):

--Cross-Site Scripting

--SQL Injection

--Buffer Overflows

--Information Disclosure

--Web-based Worm Attacks

--Application Logic Attacks

--Authentication Bypass

ICSA Labs Premier Services offers vendors of established and emerging technologies an individualized test methodology designed to test security products in a controlled network environment against specified criteria requirements. Certification by ICSA Labs required that the Citrix NetScaler Application Firewall undergo extensive real world, continuous testing to ensure that it meets the highest industry regulations and independent third party certification testing standards.

"Security is one of the most critical aspects of Web application delivery. Because Web applications connect to some of the most sensitive data in any company, they make an extremely attractive target for hackers," said Wes Wasson, vice president of marketing and product strategy, Application Networking Group, Citrix. "This ICSA Labs certification

is the most recent validation that customers can depend on the Citrix NetScaler Application Firewall to provide the most comprehensive, trusted Web application security available on the market today."

"ICSA Labs certifications are evidence of Citrix's commitment to uphold the industry's highest security standards," said Sam Glesner, Premiere Services Group Manager of ICSA Labs. "Achieving this certification for its Web application firewall product ensures that Citrix customers benefit from best practices in the security industry for all their Web application needs."

About ICSA Labs

ICSA Labs, an independent division of Cybertrust, Inc. offers vendor neutral testing and certification of security products for hundreds of the world's top security vendor products. The end-users of security technologies rely on ICSA Labs to authoritatively set and apply objective testing and certification criteria for measuring product compliance and reliability. The organization tests products in key technology categories such as anti-virus, firewall, IPsec VPN, cryptography, intrusion detection and prevention, PC firewall, content security, SSL-VPN and Wireless. For more information about ICSA Labs, please visit: http://www.icsalabs.com.

About Citrix

Citrix Systems, Inc. (Nasdaq:CTXS) is the global leader and most trusted name in on-demand access. More than 160,000 organizations around the world use the Citrix Access Platform to provide the best possible access experience to any application for any user. Citrix customers include 100% of the Fortune 100 companies and 98% of the Fortune Global 500, as well as hundreds of thousands of small businesses and individuals. Citrix has approximately 6,200 channel and alliance partners in more than 100 countries. Citrix annual revenues in 2005 were $909 million. Learn more at http://www.citrix.com.

For Citrix Investors

This release contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 21E of the Securities Exchange Act of 1934. The forward-looking statements in this release do not constitute guarantees of future performance. Those statements involve a number of factors that could cause actual results to differ materially, including risks associated with revenue growth and recognition of revenue, products, their development and distribution, product demand and pipeline, economic and competitive factors, the Company's key strategic relationships, acquisition and related integration risks as well as other risks detailed in the Company's filings with the Securities and Exchange Commission. Citrix assumes no obligation to update any forward-looking information contained in this press release or with respect to the announcements described herein.

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