The STARTTLS implementation in WatchGuard XCS 9.0 and 9.1 does not properly restrict I/O buffering, which allows man-in-the-middle attackers to insert commands into encrypted SMTP sessions by sending a cleartext command that is processed after TLS is in place, related to a "plaintext command injection" attack, a similar issue to CVE-2011-0411.
The PPTP VPN service in Watchguard Firebox before 10, when performing the MS-CHAPv2 authentication handshake, generates different error codes depending on whether the username is valid or invalid, which allows remote attackers to enumerate valid usernames.
WatchGuard ServerLock for Windows 2000 before SL 2.0.3 allows local users to load arbitrary modules via the OpenProcess() function, as demonstrated using (1) a DLL injection attack, (2) ZwSetSystemInformation, and (3) API hooking in OpenProcess.
Format string vulnerability in the CLI interface for WatchGuard Firebox Vclass 3.2 and earlier, and RSSA Appliance 3.0.2, allows remote attackers to cause a denial of service and possibly execute arbitrary code via format string specifiers in the password parameter.
The CLI interface for WatchGuard Firebox Vclass 3.2 and earlier, and RSSA Appliance 3.0.2, does not properly close the SSH connection when a -N option is provided during authentication, which allows remote attackers to access CLI with administrator privileges.
WatchGuard SOHO products running firmware 5.1.6 and earlier, and Vclass/RSSA using 3.2 SP1 and earlier, allows remote attackers to bypass firewall rules by sending a PASV command string as the argument of another command to an FTP server, which generates a response that contains the string, causing IPFilter to treat the response as if it were a legitimate PASV command from the server.
Dynamic VPN Configuration Protocol service (DVCP) in Watchguard Firebox firmware 5.x.x allows remote attackers to cause a denial of service (crash) via a malformed packet containing tab characters to TCP port 4110.
Watchguard SOHO firewall before 5.0.35 allows remote attackers to cause a denial of service (crash and reboot) when SOHO forwards a packet with bad IP options.