mapserv.c in mapserv in MapServer 4.x before 4.10.4 and 5.x before 5.2.2 does not ensure that the string holding the id parameter ends in a '\0' character, which allows remote attackers to conduct buffer-overflow attacks or have unspecified other impact via a long id parameter in a query action.

More... (http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2009-1176)