What is CVE-2016-6671?

CVE-2016-6671 is a high-severity vulnerability in Ffmpeg, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2016-12-23.

How severe is CVE-2016-6671?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Ffmpeg

CVE-2016-6671

The raw_decode function in libavcodec/rawdec.c in FFmpeg before 3.1.2 allows remote attackers to cause a denial of service (memory corruption) or execute arbitrary code via a crafted SWF file.

Vulnerability class: Buffer Overflow

Published 2016-12-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.017 (76.3th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Ffmpeg

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.openwall.com/lists/oss-security/2016/08/12/6 (mailing-list, Mailing List, Third Party Advisory)
www.securityfocus.com/bid/92447 (vdb-entry)

Frequently asked questions

What is CVE-2016-6671?: CVE-2016-6671 is a high-severity vulnerability in Ffmpeg, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.8/10. Published 2016-12-23.
How severe is CVE-2016-6671?: High severity. CVSS v3 base score is 7.8 out of 10.