{"action":"Upgrade syncthing to 1.15.1-r0 or later.","affected":[{"fixed":"1.15.1-r0","introduced":"0"}],"component":"syncthing","cve_ids":[],"ecosystem":"Alpine","ecosystem_qualifier":"Alpine:v3.16","exploited":false,"fixed_versions":["1.15.1-r0"],"id":"tcs_01M6GQH2TXZ1NR0DB37M8WM0XG","modified_at":"2026-11-03T06:32:31.743923686Z","published_at":"2021-04-06T20:15:13.490Z","references":["https://osv.dev/vulnerability/ALPINE-CVE-2021-21404","https://security.alpinelinux.org/vuln/CVE-2021-21404"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"ALPINE-CVE-2021-21404#Alpine:v3.16/syncthing","url":"https://osv.dev/vulnerability/ALPINE-CVE-2021-21404"}],"summary":"Syncthing is a continuous file synchronization program. In Syncthing before version 1.15.0, the relay server `strelaysrv` can be caused to crash and exit by sending a relay message with a negative len"}