CVE-2018-17000: Canonical Ubuntu Linux

Medium severity, CVSS 6.5. EPSS: 3.3% chance of exploitation in the next 30 days.

A NULL pointer dereference in the function _TIFFmemcmp at tif_unix.c (called from TIFFWriteDirectoryTagTransferfunction) in LibTIFF 4.0.9 allows an attacker to cause a denial-of-service through a crafted tiff file. This vulnerability can be triggered by the executable tiffcp.

Affected products

• Canonical Ubuntu Linux: version 14.04 only; version 16.04 only; version 18.04 only; version 18.10 only
• Debian Debian Linux: version 8.0 only
• Libtiff Libtiff: version 4.0.9 only

Published 2018-09-13. Last modified 2026-06-17.