The remote host is missing an update to tiff announced via advisory DSA 2210-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%202210-1

Several vulnearbilities were discovered in the TIFF manipulation and conversion library: CVE-2011-0191 A buffer overflow allows to execute arbitrary code or cause a denial of service via a crafted TIFF image with JPEG encoding. This issue affects the Debian 5.0 Lenny package only. CVE-2011-0192 A buffer overflow allows to execute arbitrary code or cause a denial of service via a crafted TIFF Internet Fax image file that has been compressed using CCITT Group 4 encoding. CVE-2011-1167 Heap-based buffer overflow in the thunder (aka ThunderScan) decoder allows to execute arbitrary code via a TIFF file that has an unexpected BitsPerSample value. For the oldstable distribution (lenny), these problems have been fixed in version 3.8.2-11.4. For the stable distribution (squeeze), these problems have been fixed in version 3.9.4-5+squeeze1. For the testing distribution, the first two problems have been fixed in version 3.9.4-8, the last problem will be fixed soon. For the unstable distribution (sid), these problems have been fixed in version 3.9.4-9. We recommend that you upgrade your tiff packages.