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An Australian university has discovered a major flaw in wireless standards that, if exploited, can jam wireless networks within five seconds. A new vulernability in Microsoft's Internet Explorer affects systems equipped with the new security-conscious Windows XP Service Pack 2, according to researchers. Security analysts at Gartner believe a flaw in Windows may be used to create a worm similar to last year's devastating "Blaster". The Australian Computer Emergency Response Team issued an advisory Thursday warning of a flaw in the 802.11 wireless protocol that makes WLANs vulnerable to a denial-of-service attack. McAfee is the latest anti-virus vendor to have a potentially serious security flaw affecting a wide range of its anti-virus products. A flaw has been found in a security product that is used across Trend Micro's range of anti-virus products. IT security specialists are warning of serious flaw in the Transmission Control Protocol (TCP).