🛡️ CVE-2020-21050 on Debian — libsixel

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

Libsixel prior to v1.8.3 contains a stack buffer overflow in the function gif_process_raster at fromgif.c.

Distribution advisory

This page covers CVE-2020-21050 as tracked by Debian, for the package libsixel. The fix is available in version 1.8.6-1; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

DEBIAN-CVE-2020-21050 is recorded against 1 package.

libsixel (fixed in 1.8.6-1)

Timeline and source

Published on 14 September 2021 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security-tracker.debian.org (Advisory)

CVE-2020-21050 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Ubuntu

Details

Severity Unknown

CVSS Score N/A

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

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2021-09-14

Updated 2026-08-20

Modified 2026-08-15

Fix URL N/A

Affected Packages

Software	From version	Fixed in
libsixel	—	1.8.6-1

References

ADVISORY https://security-tracker.debian.org/tracker/CVE-2020-21050

🔗 NVD 🔗 Mitre

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