This script is Copyright (C) 2006-2013 Tenable Network Security, Inc.
The remote FreeBSD host is missing a security-related update.
The squid patches page notes :
Squid crashes with the above assertion failure [assertion failed :
store.c:523: 'e->store_status == STORE_PENDING'] in certain conditions
involving aborted requests.
See also :
Update the affected package.
Risk factor :
Medium / CVSS Base Score : 5.0
CVSS Temporal Score : 3.7
Public Exploit Available : false