What is CVE-2017-7859?

CVE-2017-7859 is a critical-severity vulnerability in Ffmpeg, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2017-04-14.

How severe is CVE-2017-7859?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Ffmpeg

CVE-2017-7859

FFmpeg before 2017-03-05 has an out-of-bounds write caused by a heap-based buffer overflow related to the ff_h264_slice_context_init function in libavcodec/h264dec.c.

Vulnerability class: Buffer Overflow

Published 2017-04-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.2th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Ffmpeg

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

bugs.chromium.org/p/oss-fuzz/issues/detail (VDB Entry, Third Party Advisory)
www.securityfocus.com/bid/97663 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2017-7859?: CVE-2017-7859 is a critical-severity vulnerability in Ffmpeg, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2017-04-14.
How severe is CVE-2017-7859?: Critical severity. CVSS v3 base score is 9.8 out of 10.