A large number of emojis received in one message by the Skype For Business client freezes the program for a few seconds. This can be exploited to perform denial of service attacks against Skype for Business users and compromises the availability of the program. Affected includes Skype for Business 2015 (Lync 2013) before version 15.0.5075.1000 and Skype for Business 2016 before version 16.0.4756.1000.
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