The remote FreeBSD host is missing one or more security-related updates.
The Squid-2.5 patches page notes : If a certain malformed SNMP request is received squid restarts with a Segmentation Fault error. This only affects squid installations where SNMP is explicitly enabled via 'make config'. As a workaround, SNMP can be disabled by defining 'snmp_port 0' in squid.conf. Squid security advisory SQUID-2008:1 explains that Squid-3 versions up to and including Squid-3.0.STABLE6 are affected by this error, too.