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Two India based independent security researchers, Indrajeet Bhuyan and Saurav Kar, both 17-year old teenagers discovered the vulnerability.
With 2000 words (2kb in size) message in special character set can crash Whatsapp messenger app. Previous it was discovered that sending a huge message ( greater than 7mb in size) on Whatsapp could crash victim device and app immediately, but using this new exploit attacker only need to send a very small size (approx 2kb) message to the victim.
The worried impact of the vulnerability is that the user who received the specially crafted message will have to delete his/her whole conversation and start a fresh chat, because opening the message keeps on crashing WhatsApp unless the chat is deleted completely.
THIS VULNERABILITY ONLY WORKS IN ANDROID!!!
Here's the message to paste for the victim: http://pastebin.com/3efiBva4