{"api_version":"1","generated_at":"2026-04-22T21:27:36+00:00","cve":"CVE-2021-27905","urls":{"html":"https://cve.report/CVE-2021-27905","api":"https://cve.report/api/cve/CVE-2021-27905.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2021-27905","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-27905"},"summary":{"title":"CVE-2021-27905","description":"The ReplicationHandler (normally registered at \"/replication\" under a Solr core) in Apache Solr has a \"masterUrl\" (also \"leaderUrl\" alias) parameter that is used to designate another ReplicationHandler on another Solr core to replicate index data into the local core. To prevent a SSRF vulnerability, Solr ought to check these parameters against a similar configuration it uses for the \"shards\" parameter. Prior to this bug getting fixed, it did not. 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