libavcodec/webp.c in FFmpeg before 2.8.12, 3.0.x before 3.0.8, 3.1.x before 3.1.8, 3.2.x before 3.2.5, and 3.3.x before 3.3.1 does not ensure that pix_fmt is set, which allows remote attackers to cause a denial of service (heap-based buffer overflow and application crash) or possibly have unspecified other impact via a crafted file, related to the vp8_decode_mb_row_no_filter and pred8x8_128_dc_8_c functions.
http://www.securityfocus.com/bid/99317
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1434
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=1435
https://github.com/FFmpeg/FFmpeg/commit/6b5d3fb26fb4be48e4966e4b1d97c2165538d4ef
https://lists.debian.org/debian-lts-announce/2019/01/msg00006.html
Source: MITRE
Published: 2017-06-28
Updated: 2019-03-20
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: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH