3COM OfficeConnect 812 and 840 ADSL Router 4.2, running OCR812 router software 1.1.9 and earlier, allows remote attackers to cause a denial of service via a long string containing a large number of "%s" strings, possibly triggering a format string vulnerability.

3Com OfficeConnect Remote 812 ADSL Router, firmware 1.1.9 and 1.1.7, allows remote attackers to bypass port access restrictions by connecting to an approved port and quickly connecting to the desired port, which is allowed by the router.

3com OfficeConnect Remote 812 ADSL Router 1.1.7 does not properly clear memory from DHCP responses, which allows remote attackers to identify the contents of previous HTTP requests by sniffing DHCP packets.

Buffer overflow in 3Com OfficeConnect Remote 812 ADSL Router 1.1.9.4 allows remote attackers to cause a denial of service (reboot or packet loss) via a long string containing Telnet escape characters to the Telnet port.

Unknown vulnerability in 3Com OfficeConnect Remote 812 ADSL Router allows remote attackers to bypass authentication via repeated attempts using any username and password. NOTE: this identifier was inadvertently re-used for another issue due to a typo; that issue was assigned CVE-2004-0447. This candidate is ONLY for the ADSL router bypass.