{"action":"Upgrade synapse to 1.30.1-r0 or later.","affected":[{"fixed":"1.30.1-r0","introduced":"0"}],"component":"synapse","cve_ids":[],"ecosystem":"Alpine","ecosystem_qualifier":"Alpine:v3.17","exploited":false,"fixed_versions":["1.30.1-r0"],"id":"tcs_01M6GZ028VECT5NE87P6BW3RWH","modified_at":"2026-11-03T06:32:47.662266203Z","published_at":"2021-03-25T15:15:13.450Z","references":["https://osv.dev/vulnerability/ALPINE-CVE-2021-3449","https://security.alpinelinux.org/vuln/CVE-2021-3449"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"ALPINE-CVE-2021-3449#Alpine:v3.17/synapse","url":"https://osv.dev/vulnerability/ALPINE-CVE-2021-3449"}],"summary":"An OpenSSL TLS server may crash if sent a maliciously crafted renegotiation ClientHello message from a client. If a TLSv1.2 renegotiation ClientHello omits the signature_algorithms extension (where it"}