https://www.vice.com/en_us/article/g5gan4/apple-still-investigating-unpatched-and-public-iphone-vulnerabilities

On Thursday, a security researcher published details of three iPhone vulnerabilities that are unpatched as of today. The security researcher, whose name is Denis Tokarev, said he decided to publish the bugs' details as well as the source code that makes it extremely easy to reproduce and exploit them, because he was tired of waiting and felt like Apple ignored him. 

Tokarev reported the vulnerabilities to Apple between March 10 and April 29, but the last time he heard back from Apple about the three vulnerabilities was August 6, August 12, August 25, respectively. Then the researcher said he told Apple on September 13 he would publish details of the bugs unless he heard back.