What is CVE-2018-20001?

CVE-2018-20001 is a medium-severity vulnerability in Libav, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2018-12-10.

How severe is CVE-2018-20001?

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

Improper input validation in Libav

CVE-2018-20001

In Libav 12.3, there is a floating point exception in the range_decode_culshift function (called from range_decode_bits) in libavcodec/apedec.c that will lead to remote denial of service via crafted input.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2018-12-10 · 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 (61.7th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 62nd percentile — 61.7% 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 12.3

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

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

Frequently asked questions

What is CVE-2018-20001?: CVE-2018-20001 is a medium-severity vulnerability in Libav, classified under Improper Input Validation. CVSS score: 6.5/10. Published 2018-12-10.
How severe is CVE-2018-20001?: Medium severity. CVSS v3 base score is 6.5 out of 10.