Wireshark is a program for monitoring network traffic.
Several denial of service bugs were found in Wireshark's LLT, IEEE 802.11, http, and tcp protocol dissectors. It was possible for Wireshark to crash or stop responding if it read a malformed packet off the network. (CVE-2007-0456, CVE-2007-0457, CVE-2007-0458, CVE-2007-0459)
Users of Wireshark should upgrade to these updated packages containing Wireshark version 0.99.5, which is not vulnerable to these issues.