Integer overflow in conf.c in Tinyproxy before 1.8.3 might allow remote attackers to bypass intended access restrictions in opportunistic circumstances via a TCP connection, related to improper handling of invalid port numbers.
acl.c in Tinyproxy before 1.8.3, when an Allow configuration setting specifies a CIDR block, permits TCP connections from all IP addresses, which makes it easier for remote attackers to hide the origin of web traffic by leveraging the open HTTP proxy server.