VirnetX Receives Markman Order In Patent Infringement Action Against Avaya and Siemens

Court Stands by Original Ruling

ZEPHYR COVE, Nevada – August 2, 2012 – VirnetX Holding Corporation (NYSE MKT: VHC), an Internet security software and technology company, announced today that on August  1, 2012, the United States District Court for the Eastern District of Texas, Tyler Division, issued its patent claim construction, or “Markman” Order (“Markman Order”) in the ongoing patent infringement action between VirnetX Inc. (“VirnetX”) and Avaya Inc. and Siemens Enterprise Communications GmBH & Co. KG; Siemens Enterprise Communications, Inc.

In a Markman ruling, a district court hearing a patent infringement case interprets and rules on the scope and meaning of disputed patent claim language regarding the patents in suit. A Markman decision is often a significant factor in the progress and outcome of patent infringement litigation.

In the recently issued Markman Order, the Court denied the request by the defendants to change the interpretation of some of the claim terms that were in dispute in the litigation, leaving them unchanged from what was previously adopted by the court in the Markman ruling in its other ongoing infringement action against Cisco, Apple and NEC.

“We are extremely pleased with the Court’s Markman Order. We remain confident in the merits of our complaint against Avaya and Siemens” said Kendall Larsen, VirnetX President and CEO. “While the outcome of this and any legal matter is unpredictable, we believe the Court’s Markman Order is another significant step towards the successful resolution of this litigation.”

About VirnetX

VirnetX Holding Corporation is an Internet security software and technology company with patented technology for secure communications including 4G LTE security. The Company’s software and technology solutions, including its secure domain name registry and GABRIEL Connection Technology™, are designed to facilitate secure communications and to create a secure environment for real-time communication applications such as instant messaging, VoIP, smart phones, eReaders and video conferencing. The Company’s patent portfolio includes 20 U.S. and 26 international patents and over 100 pending applications. For more information, please visit www.virnetx.com.

Forward Looking Statements

Statements in this press release that are not statements of historical or current fact, including statements regarding the  strength of the patent portfolio, constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995, including statements regarding the Company’s patent portfolio, legal proceedings and licensing efforts. Such forward-looking statements are based on expectations, estimates and projections about the markets in which the Company operates, management’s beliefs, and certain assumptions made by management and involve known and unknown risks, uncertainties and other unknown factors that could cause the actual results of the Company to be materially different from the historical results or from any future results expressed or implied by such forward-looking statements, including but not limited to (1) the outcome of any legal proceedings that have been or may be initiated by the Company or that may be initiated against the Company; (2) the ability to capitalize on the Company’s patent portfolio and generate licensing fees and revenues; (3) the ability of the Company to be successful in entering into licensing relationships with its targeted customers on commercially acceptable terms; (4) potential challenges to the validity of the Company’s patents underlying its licensing opportunities; (5) the ability of the Company to achieve widespread customer adoption of the Company’s GABRIEL Communication Technology™ and its secure domain name registry; (6) the level of adoption of the 3GPP Series 33 security specifications; and (7) the possibility that Company may be adversely affected by other economic, business, and/or competitive factors. In addition to statements which explicitly describe such risks and uncertainties, readers are urged to consider statements labeled with the terms “believes,” “belief,” “expects,” “intends,” “anticipates,” or “plans” to be uncertain and forward-looking. The forward-looking statements contained herein are also subject generally to other risks and uncertainties that are described from time to time in the Company’s reports and registration statements filed with the Securities and Exchange Commission, including those under the heading “Risk Factors” in Company’s Annual Report on Form 10-K filed with the SEC on February 29, 2012 and in the Company’s Quarterly Report on Form 10-Q filed with the SEC on May 10, 2011.  Many of the factors that will determine the outcome of the subject matter of this press release are beyond the Company’s ability to control or predict. Except as required by law, the Company is under no duty to update any of the forward-looking statements after the date of this press release to conform to actual results.

Contact:

Greg Wood

VirnetX Holding Corporation

775.548.1785

greg_wood@virnetx.com

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