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.
Published: 2021-08-10
Score: 6.5 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2020-14445 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.
History

Fri, 24 Apr 2026 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Saitoha
Saitoha libsixel
CPEs cpe:2.3:a:libsixel_project:libsixel:1.8.4:*:*:*:*:*:*:* cpe:2.3:a:saitoha:libsixel:1.8.4:*:*:*:*:*:*:*
Vendors & Products Libsixel Project
Libsixel Project libsixel
Saitoha
Saitoha libsixel

Subscriptions

Saitoha Libsixel
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2024-08-04T14:30:33.580Z

Reserved: 2020-08-13T00:00:00.000Z

Link: CVE-2020-21677

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Modified

Published: 2021-08-10T21:15:07.447

Modified: 2026-04-24T12:56:58.623

Link: CVE-2020-21677

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses