CVE-2020-21677

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.

CVSS v3.1 NVD

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

CVSS v2.0 NVD

4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:N/A:P

EPSS

0.90% chance of exploitation in the next 30 days, 59th percentile

Published

2021-08-10

Updated

2024-08-04

Proof-of-concept exploits (1)

• saitoha/libsixel/issues/1232853★ · 2026-10-13

References

• CVE Record
• NVD entry

Related

• CVE-2019-11024
• CVE-2019-19777
• CVE-2019-19778
• CVE-2019-20022
• CVE-2019-20023
• CVE-2019-20024