What is CVE-2017-18243?

CVE-2017-18243 is a medium-severity vulnerability in Libav, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.5/10. Published 2018-03-22.

How severe is CVE-2017-18243?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Buffer overflow in Libav

CVE-2017-18243

The unpack_parse_unit function in libavcodec/dirac_parser.c in Libav 12.2 allows remote attackers to cause a denial of service (segmentation fault) via a crafted file.

Vulnerability class: Buffer Overflow

Published 2018-03-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: -0.000

Affected products

Libav — versions 12.2

Weakness classification (CWE)

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

References

bugzilla.libav.org/show_bug.cgi (Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2017-18243?: CVE-2017-18243 is a medium-severity vulnerability in Libav, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 6.5/10. Published 2018-03-22.
How severe is CVE-2017-18243?: Medium severity. CVSS v3 base score is 6.5 out of 10.