The remote host is missing an update to mplayer announced via advisory DSA 1552-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201552-1

It was discovered that the MPlayer movie player performs insufficient input sanitising on SDP session data, leading to potential execution of arbitrary code through a malformed multimedia stream. For the stable distribution (etch), this problem has been fixed in version 1.0~rc1-12etch3. For the unstable distribution (sid), this problem has been fixed in version 1.0~rc2-10. We recommend that you upgrade your mplayer package.