CVE-2020-21548

HIGH

libsixel 1.8.3 - Heap-Based Buffer Overflow in sixel_encode_highcolor

Title source: llm
STIX 2.1

Description

Libsixel 1.8.3 contains a heap-based buffer overflow in the sixel_encode_highcolor function in tosixel.c.

References (1)

Core 1
Core References
Exploit, Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://github.com/saitoha/libsixel/issues/116

Scores

CVSS v3 8.8
EPSS 0.0103
EPSS Percentile 59.8%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Details

CWE
CWE-787
Status published
Products (2)
libsixel_project/libsixel 1.8.3
saitoha/libsixel 1.8.3
Published Sep 17, 2021
Tracked Since Feb 18, 2026