The remote host is missing an update to cron announced via advisory DSA 054-1.
A recent (fall 2000) security fix to cron introduced an error in giving up privileges before invoking the editor. A malicious user could easily gain root access. This has been fixed in version 3.0pl1-57.3 (or 3.0pl1-67 for unstable). No exploits are known to exist, but we recommend that you upgrade your