Blue Coat Systems' WinProxy SecureSuite contains critical vulnerabilities that could allow remote intruders to execute arbitrary commands or cause a Denial of Service (DoS) condition. A buffer overflow could occur when processing HTTP headers, and a heap overflow could occur when processing network traffic through the Telnet proxy. Both overflow conditions could allow a remote intruder to execute arbitrary commands. Errors when processing overly long HTTP requests could lead to a DoS. Blue Coat Systems released WinProxy 6.1a, which corrects these problems.