The remote host is missing an update to the system as announced in the referenced advisory.

Update your system with the appropriate patches or software upgrades.

The following packages are affected: php4-mbstring php5-mbstring CVE-2008-5557 Heap-based buffer overflow in ext/mbstring/libmbfl/filters/mbfilter_htmlent.c in the mbstring extension in PHP 4.3.0 through 5.2.6 allows context-dependent attackers to execute arbitrary code via a crafted string containing an HTML entity, which is not properly handled during Unicode conversion, related to the (1) mb_convert_encoding, (2) mb_check_encoding, (3) mb_convert_variables, and (4) mb_parse_str functions.