The ReadWPGImage function in coders/wpg.c in ImageMagick 7.0.7-9 does not properly validate the colormap index in a WPG palette, which allows remote attackers to cause a denial of service (use of uninitialized data or invalid memory allocation) or possibly have unspecified other impact via a malformed WPG file.
https://github.com/ImageMagick/ImageMagick/commit/2130bf6f89ded32ef0c88a11694f107c52566c53
https://github.com/ImageMagick/ImageMagick/commit/e04cf3e9524f50ca336253513d977224e083b816
https://github.com/ImageMagick/ImageMagick/issues/851
https://usn.ubuntu.com/3681-1/
Source: MITRE
Published: 2017-11-05
Updated: 2020-10-22
Type: CWE-119
Base Score: 6.8
Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P
Impact Score: 6.4
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 8.8
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 2.8
Severity: HIGH