Bar Mitzvah attack
A 2015 attack on RC4 in TLS that exploited a weakness then thirteen years old — hence the name.
Itsik Mantin of Imperva presented it at Black Hat Asia in March 2015. It relies on RC4's "invariance weakness", a class of weak keys described back in 2001–2002 in the same line of research as the FMS attack on WEP. With such a key, the first hundred or so bytes of keystream leak patterns, and with them parts of the plaintext — cookies or passwords sitting at the start of a session.
Only about one connection in sixteen million hits a weak key, so it was more statistics than break-in. But it landed the month after RFC 7465 had banned RC4 from TLS, and it was one of several arguments that finally pushed browsers to switch the cipher off altogether.