CVE-2020-21677

Published: Aug 10, 2021Modified: Apr 24, 2026

6.5

Vector

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

Exploitability: 2.8 / Impact: 3.6

Source: NVD

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.

Affected (1)

Products: Saitoha: Libsixel

Saitoha

1 product

Libsixel

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Saitoha Libsixel	Version 1.8.4

Related CWEs

CWE-787

Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

References (2)

https://github.com/saitoha/libsixel/issues/123

Source: cve@mitre.org

ExploitIssue TrackingPatchThird Party Advisory

https://github.com/saitoha/libsixel/issues/123

Source: af854a3a-2127-422b-91ae-364da2661108

ExploitIssue TrackingPatchThird Party Advisory

Timeline

No history available yet.