Buffer overflow in the Unescape function in common/util/hxurl.cpp and
player/hxclientkit/src/CHXClientSink.cpp in Helix Player 1.0.6 and
RealPlayer allows remote attackers to cause a denial of service
(application crash) or possibly execute arbitrary code via a URL
argument containing a % (percent) character that is not followed by
two hex digits.
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