An issue was discovered on D-Link DIR-850L 1.21WW devices. A partially completed WPA handshake is sufficient for obtaining full access to the wireless network. A client can access the network by sending packets on Data Frames to the AP without encryption.
https://www.synopsys.com/blogs/software-security/wpa2-encryption-bypass-defensics-fuzzing/
https://supportannouncement.us.dlink.com/announcement/publication.aspx?name=SAP10097