What is CVE-2015-8661?

CVE-2015-8661 is a high-severity vulnerability in Ffmpeg, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.3/10. Published 2015-12-24.

How severe is CVE-2015-8661?

High severity. CVSS v3 base score is 8.3 out of 10.

Buffer overflow in Ffmpeg

CVE-2015-8661

The h264_slice_header_init function in libavcodec/h264_slice.c in FFmpeg before 2.8.3 does not validate the relationship between the number of threads and the number of slices, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via crafted H.264 data.

Vulnerability class: Buffer Overflow

Published 2015-12-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.3 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.019 (79.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 79.0% 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-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

git.videolan.org/
www.securitytracker.com/id/1034539 (vdb-entry)
lists.debian.org/debian-lts-announce/2018/12/msg00009.html (mailing-list)
lists.opensuse.org/opensuse-security-announce/2016-01/msg00004.html (vendor-advisory)

Frequently asked questions

What is CVE-2015-8661?: CVE-2015-8661 is a high-severity vulnerability in Ffmpeg, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 8.3/10. Published 2015-12-24.
How severe is CVE-2015-8661?: High severity. CVSS v3 base score is 8.3 out of 10.