SonicWALL Internet Threat Prevention Provides Zero Day Protection Against Windows DNS Server Service Vulnerability

SonicWALL, Inc. (Nasdaq: SNWL), a leading provider of network, Web, email security and backup and recovery solutions, announced today that its Unified Threat Management (UTM) technology has distributed defensive measures to its customers on a zero day basis against a newly-discovered Windows DNS Server Service vulnerability. SonicWALL first issued signatures designed to protect subscribers of SonicWALL's dynamic threat prevention services against exploits of this vulnerability on Friday, April 13 and has continued to issue updated signatures as more information and exploits have been discovered.

The DNS Server Service translates web site text names into IP addresses so that requests are routed to the correct server. While the number of exploits has been limited, they are considered dangerous. Because it is a server problem, all users of an infected server can be affected. Exploits of this vulnerability can potentially affect servers that run on Microsoft Windows 2000 Server Service Pack 4, Windows Server 2003 SP 1, and Windows Server 2003 SP 2.

The DNS Server Service vulnerability is being exploited via RPC requests that run malicious code in the remote management component of the server. Hackers are then able to divert web traffic, potentially forwarding victims to a malicious web site infected with malware when a user of that server types in a web address.

Users of SonicWALL's dynamic threat prevention services are currently protected by main signatures:

IPS: SID #2442 -- Windows DNS Server RPC Management Interface BO

Generic 2.

GAV: RinBot.A (Worm)

SonicWALL has developed unique technologies to deliver zero day gateway anti-virus, anti-spyware and intrusion prevention signatures to its subscribers on a continual basis, allowing them to defend against vulnerabilities like the DNS Server Service vulnerability as well as attacks and exploits such as phishing, viruses, DHA or DoS attacks and more.

Further information on these and other vulnerabilities is available at:

http://software.sonicwall.com/applications/ips/index.asp?ev=sig&sigid=2034

https://www.mysonicwall.com/SonicAlert/index.asp?ev=article&id=27

About SonicWALL, Inc.

Founded in 1991, SonicWALL, Inc. designs, develops and manufactures comprehensive network security, email security, secure remote access, and backup and recovery solutions. SonicWALL is headquartered in Sunnyvale, California and trades on the NASDAQ under the symbol SNWL. For more information, contact SonicWALL at +1 (408) 745-9600 or visit the company web site at http://www.sonicwall.com/.

Safe Harbor Regarding Forward-Looking Statements

Certain statements in this press release are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. The forward-looking statements include but are not limited to statements regarding our ability to deliver gateway anti-virus, anti-spyware and intrusion prevention signatures on a continual basis, our ability to defend against new and existing Internet attacks and exploits and our ability to update signatures as exploits are discovered. These forward-looking statements are based on the opinions and estimates of management at the time the statements are made and are subject to certain risks and uncertainties that could cause actual results to differ materially from those anticipated in the forward-looking statements. In addition, please see the "Risk Factors" described in our Securities and Exchange Commission filings, including our Annual Report on Form 10-K for the year ended December 31, 2006, for a more detailed description of the risks facing our business. All forward-looking statements included in this release are based upon information available to SonicWALL as of the date of the release, and we assume no obligation to update any such forward-looking statement. All forward-looking statements included in this release are based upon information available to SonicWALL as of the date of the release, and we assume no obligation to update any such forward-looking statement.

NOTE: SonicWALL is a registered trademark of SonicWALL, Inc. Other product and company names mentioned herein may be trademarks and/or registered trademarks of their respective companies.

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