What is CVE-2016-9823?

CVE-2016-9823 is a medium-severity vulnerability in Libav, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2017-03-01.

How severe is CVE-2016-9823?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Is CVE-2016-9823 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Libav

CVE-2016-9823

libavcodec/x86/mpegvideo.c in libav 11.8 allows remote attackers to cause a denial of service (crash) via a crafted file.

Vulnerability class: Buffer Overflow

Published 2017-03-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (59.3th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Libav — versions 11.8

Weakness classification (CWE)

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

Public proof-of-concept exploits

mrash/afl-cve

References

www.securityfocus.com/bid/94732 (vdb-entry)
blogs.gentoo.org/ago/2016/12/01/libav-multiple-crashes-from-the-undefined-behav… (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2016-9823?: CVE-2016-9823 is a medium-severity vulnerability in Libav, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2017-03-01.
How severe is CVE-2016-9823?: Medium severity. CVSS v3 base score is 5.5 out of 10.
Is CVE-2016-9823 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.