Stonesoft - Company Announcement

STONESOFT CORPORATION: ADVANCED EVASION TECHNIQUES BYPASS ALMOST ALL CURRENT NETWORK SECURITY SYSTEMS WITHOUT LEAVING A TRACE

Stonesoft Corporation Stock Exchange Release 18 October 2010 at 10:58 AM

In the stock exchange release published on 4 October, 2010 Stonesoft Corporation
announced it has discovered a new network security threat category. These are
so-called Advanced Evasion Techniques (AET), which can bypass current network
security devices without leaving a trace. Advanced Evasion Techniques can also
transport already known malware or phishing programs, worms and viruses, which
otherwise would be detectable and stoppable by network security systems.

Stonesoft has reported the threat posed by these advanced evasion techniques to
the national computer security incident response team of Finland CERT-FI for
vulnerability coordination, and ICSA Labs, a US-based security-product testing
and certification laboratory has confirmed the severity of the discovery.

In addition to testing their own network security solutions, Stonesoft has
extended their research to cover also solutions by other leading vendors in the
field. The test results show that most of current network security solutions do
not detect attacks that utilize advanced evasion techniques. The most efficient
protection against the threat posed by advanced evasions techniques is provided
by software-based systems, which can be remotely updated and centrally managed.
Stonesoft's network security solutions fulfill these criteria.

Stonesoft estimates the discovery to open new business opportunities for the
company and to have a positive effect on the company's net sales, but it still
cannot estimate the magnitude nor the schedule of this effect.

More information about advanced evasion techniques is available at Stonesoft
website www.stonesoft.com and at the web address antievasion.com.

Stonesoft Corporation
Ilkka Hiidenheimo
CEO

For further information, please contact:
Ilkka Hiidenheimo, Chief Executive Officer, Stonesoft Corporation
Tel. +358 9 47 67 11
E-mail: ilkka.hiidenheimo@stonesoft.com

Distribution:
NASDAQ OMX Helsinki Ltd
Main media
www.stonesoft.com



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