The remote host is using Lynx as a web browser. The version used is vulnerable to a format string vulnerability (present only when the syslog() is activated for URIs). An attacker may use this flaw by setting up a rogue web server with a malformed URI that contains a format string. The attacker would then be able to execute commands with the privileges of the user.
Upgrade to Lynx 2.8.5 dev 6 or higher.