{"action":"Upgrade matrix-synapse to 1.28.0 or later.","affected":[{"fixed":"1.28.0","introduced":"0"}],"component":"matrix-synapse","cve_ids":["CVE-2021-21394"],"ecosystem":"PyPI","epss":0.01538,"exploited":false,"fixed_versions":["1.28.0"],"ghsa_id":"GHSA-w9fg-xffh-p362","id":"tcs_01M5KGC1TNJMY9WM5S46KHDJWH","modified_at":"2023-11-08T04:04:44.473775Z","published_at":"2021-04-12T21:15:00Z","references":["https://osv.dev/vulnerability/PYSEC-2021-27","https://github.com/matrix-org/synapse/pull/9321","https://pypi.org/project/matrix-synapse/","https://github.com/matrix-org/synapse/pull/9393","https://github.com/matrix-org/synapse/security/advisories/GHSA-w9fg-xffh-p362"],"severity":{"label":"unknown"},"sources":[{"source":"osv","source_id":"PYSEC-2021-27","url":"https://osv.dev/vulnerability/PYSEC-2021-27"}],"summary":"Synapse is a Matrix reference homeserver written in python (pypi package matrix-synapse). Matrix is an ecosystem for open federated Instant Messaging and VoIP. In Synapse before version 1.28.0 Synapse"}