The remote Debian host is missing a security-related update.
Multiple vulnerabilities in OpenJPEG, a JPEG 2000 image compression / decompression library, may result in denial of service or the execution of arbitrary code if a malformed JPEG 2000 file is processed.
Upgrade the openjpeg2 packages. For the oldstable distribution (jessie), these problems have been fixed in version 2.1.0-2+deb8u3. For the stable distribution (stretch), these problems have been fixed in version 2.1.2-1.1+deb9u2.