{"action":"Upgrade libvncserver to 0.9.13+dfsg-1 or later.","affected":[{"fixed":"0.9.13+dfsg-1","introduced":"0"}],"component":"libvncserver","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["0.9.13+dfsg-1"],"id":"tcs_01M5NE555EXYSGDSPXM7XEQ69G","modified_at":"2026-09-21T07:00:32.304582360Z","published_at":"2020-06-17T16:15:11.523Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2019-20840","https://security-tracker.debian.org/tracker/CVE-2019-20840"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2019-20840","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2019-20840"}],"summary":"An issue was discovered in LibVNCServer before 0.9.13. libvncserver/ws_decode.c can lead to a crash because of unaligned accesses in hybiReadAndDecode."}