The remote host is missing an update to libexif announced via advisory DSA 709-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20709-1

Sylvain Defresne discovered a buffer overflow in libexif, a library that parses EXIF files (such as JPEG files with extra tags). This bug could be exploited to crash the application and maybe to execute arbitrary code as well. For the stable distribution (woody) this problem has been fixed in version 0.5.0-1woody1. For the unstable distribution (sid) this problem has been fixed in version 0.6.9-5. We recommend that you upgrade your libexif package.