What is CVE-2019-20024?

CVE-2019-20024 is a medium-severity vulnerability in Saitoha Libsixel, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2019-12-27.

How severe is CVE-2019-20024?

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

Buffer overflow in Saitoha Libsixel

CVE-2019-20024

A heap-based buffer overflow was discovered in image_buffer_resize in fromsixel.c in libsixel before 1.8.4.

Vulnerability class: Buffer Overflow

Published 2019-12-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.010 (61.1th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 61.1% 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

Saitoha Libsixel

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

github.com/saitoha/libsixel/issues/121 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2019-20024?: CVE-2019-20024 is a medium-severity vulnerability in Saitoha Libsixel, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2019-12-27.
How severe is CVE-2019-20024?: Medium severity. CVSS v3 base score is 6.5 out of 10.