{"id":"CVE-2020-21677","details":"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.","modified":"2026-07-09T02:58:37.052857Z","published":"2021-08-10T21:15:07.447Z","references":[{"type":"FIX","url":"https://github.com/saitoha/libsixel/issues/123"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/saitoha/libsixel","events":[{"introduced":"686d234ae20f97b9d816d4147ba3f4b90dbae72e"},{"last_affected":"686d234ae20f97b9d816d4147ba3f4b90dbae72e"}],"database_specific":{"extracted_events":[{"introduced":"1.8.4"},{"last_affected":"1.8.4"}],"source":"CPE_STRING","cpe":"cpe:2.3:a:saitoha:libsixel:1.8.4:*:*:*:*:*:*:*"}}],"versions":["1.8.4","v1.8.4"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-21677.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"}]}