VULNERABILITY INTELLIGENCE

CVE-2020-21677

CVSS score6.5 MEDIUM

EPSS probability0.90%

CISA KEVNot currently listed

Published2021-08-10

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Description

A heap-based buffer overflow in the sixel_encoder_output_without_macro function in encoder.c of Libsixel 1.8.4 allows attackers to cause a denial of service (DOS) via converting a crafted PNG file into Sixel format.

Weakness classification

nvd@nist.gov: CWE-787

Primary references

cve@mitre.org — Exploit, Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108 — Exploit, Issue Tracking, Patch, Third Party Advisory