|php_imap.c in PHP 5.2.5, 5.2.6, 4.x, and other versions, uses obsolete
API calls that allow context-dependent attackers to cause a denial of
service (crash) and possibly execute arbitrary code via a long IMAP
request, which triggers an "rfc822.c legacy routine buffer overflow"
error message, related to the rfc822_write_address function.