** UNSUPPORTED WHEN ASSIGNED ** A heap-based buffer overflow exists in XML Decompression DecodeTreeBlock in AT&T Labs Xmill 0.7. A crafted input file can lead to remote code execution. This is not the same as any of: CVE-2021-21810 CVE-2021-21811 CVE-2021-21812 CVE-2021-21815 CVE-2021-21825 CVE-2021-21826 CVE-2021-21828 CVE-2021-21829 or CVE-2021-21830. NOTE: This vulnerability only affects products that are no longer supported by the maintainer.