In LibTIFF 4.0.9, there is a NULL pointer dereference in the TIFFWriteDirectorySec function in tif_dirwrite.c that will lead to a denial of service attack, as demonstrated by tiffset.
http://bugzilla.maptools.org/show_bug.cgi?id=2820
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00041.html
http://www.securityfocus.com/bid/105932
https://lists.debian.org/debian-lts-announce/2019/02/msg00026.html
Source: MITRE
Published: 2018-11-12
Updated: 2019-04-05
Type: CWE-476
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 6.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 2.8
Severity: MEDIUM