What is CVE-2018-20409?

CVE-2018-20409 is a medium-severity vulnerability in Axiosys Bento4, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2018-12-23.

How severe is CVE-2018-20409?

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

Out-of-bounds Read in Axiosys Bento4

CVE-2018-20409

An issue was discovered in Bento4 1.5.1-627. There is a heap-based buffer over-read in AP4_AvccAtom::Create in Core/Ap4AvccAtom.cpp, as demonstrated by mp42hls.

Vulnerability class: Buffer Overflow

Published 2018-12-23 · 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: 0.011 (65.7th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Axiosys Bento4 — versions 1.5.1-627

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

github.com/axiomatic-systems/Bento4/issues/345 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2018-20409?: CVE-2018-20409 is a medium-severity vulnerability in Axiosys Bento4, classified under Out-of-bounds Read. CVSS score: 6.5/10. Published 2018-12-23.
How severe is CVE-2018-20409?: Medium severity. CVSS v3 base score is 6.5 out of 10.