The remote host is missing an update as announced via advisory SSA:2003-253-01.
Upgraded pine packages are available for Slackware 8.1, 9.0 and - -current. These fix two security problems found by iDEFENSE Labs which could lead to arbitrary code execution when a specially crafted email is processed by Pine. This problem is fixed in Pine 4.58. Sites which use the Pine mail reader should upgrade.