ssl/s3_pkt.c in OpenSSL before 0.9.8i allows remote attackers to cause a denial of service (NULL pointer dereference and daemon crash) via a DTLS ChangeCipherSpec packet that occurs before ClientHello.
The DRDA protocol dissector in Wireshark can enter an infinite loop when processing an specially crafted DRDA packet with the iLength field set to 0, causing Wireshark to stop responding.