CVE-2020-21677

PoC —

CVSS 3.1

6.5 medium

EPSS

<1%p58

Published

Aug 10, 2021 (Aug 10, 2021)

Modified

Jun 17, 2026

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.

Vendors: saitoha
Products: libsixel
Weakness: CWE-787
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

NVD CVE.org GitHub PoCs EPSS (0.9%)

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