{"id":"BIT-mongodb-2021-20330","summary":"Specific replication command with malformed oplog entries can crash secondaries","details":"An attacker with basic CRUD permissions on a replicated collection can run the applyOps command with specially malformed oplog entries, resulting in a potential denial of service on secondaries. This issue affects MongoDB Server v4.0 versions prior to 4.0.27; MongoDB Server v4.2 versions prior to 4.2.16; MongoDB Server v4.4 versions prior to 4.4.9.","aliases":["CVE-2021-20330"],"modified":"2026-09-08T08:46:34.685626742Z","published":"2024-03-06T10:58:03.684Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*"]},"references":[{"type":"ADVISORY","url":"https://jira.mongodb.org/browse/SERVER-36263"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-20330"}],"affected":[{"package":{"name":"mongodb","ecosystem":"Bitnami","purl":"pkg:bitnami/mongodb"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.0.0"},{"fixed":"4.0.25"},{"introduced":"4.2.0"},{"fixed":"4.2.14"},{"introduced":"4.4.0"},{"fixed":"4.4.6"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mongodb/BIT-mongodb-2021-20330.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}],"schema_version":"1.9.0"}