It was reported  that tinyproxy prior to version 1.8.3, when configured to allow a network range (i.e. "Allow 192.168.0.0/24" versus the default "Allow 127.0.0.1"), would allow any connections from any IP address, turning it into an open proxy. If tinyproxy were configured with one or more Allow statements that use an IP range, this would occur.
This has been fixed upstream  and affects the versions of tinyproxy as provided by Fedora and EPEL.
This was assigned the name CVE-2011-1499.
Common Vulnerabilities and Exposures assigned an identifier CVE-2011-1843 to
the following vulnerability:
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.
The above is a related but slightly different issue (note the same bug, but different commits).
Created tinyproxy tracking bugs for this issue
Affects: fedora-all [bug 701687]
Affects: epel-all [bug 701688]
tinyproxy-1.8.3-1.fc19 has been pushed to the Fedora 19 stable repository. If problems still persist, please make note of it in this bug report.
tinyproxy-1.8.3-1.fc20 has been pushed to the Fedora 20 stable repository. If problems still persist, please make note of it in this bug report.