{"action":"Upgrade claws-mail to 3.17.6-1 or later.","affected":[{"fixed":"3.17.6-1","introduced":"0"}],"component":"claws-mail","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:12","exploited":false,"fixed_versions":["3.17.6-1"],"id":"tcs_01M5NENVR7S662FM65FS8F73KQ","modified_at":"2026-09-11T11:01:30.813011212Z","published_at":"2020-07-23T19:15:10.137Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2020-15917","https://security-tracker.debian.org/tracker/CVE-2020-15917"],"severity":{"label":"critical","score":9.8},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2020-15917","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2020-15917"}],"summary":"common/session.c in Claws Mail before 3.17.6 has a protocol violation because suffix data after STARTTLS is mishandled."}