{"id":"CVE-2021-34418","aliases":["EUVD-2021-21076","GHSA-9m9w-fffc-45mm"],"status":"published","title":"Pre-auth Null pointer crash in on-premise web console","description":"The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.","severity":{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00628,"percentile":0.50608,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-476"],"published":"2021-11-11T22:59:47Z","modified":"2026-06-17T03:55:49Z","products":[{"vendor":"zoom","product":"zoom_on-premise_meeting_connector_controller"},{"vendor":"zoom","product":"zoom_on-premise_meeting_connector_mmr"},{"vendor":"zoom","product":"zoom_on-premise_recording_connector"},{"vendor":"zoom","product":"zoom_on-premise_virtual_room_connector"},{"vendor":"zoom","product":"zoom_on-premise_virtual_room_connector_load_balancer"},{"vendor":"zoom video communications inc","product":"zoom on-premise meeting connector"},{"vendor":"zoom video communications inc","product":"zoom on-premise meeting connector mmr"},{"vendor":"zoom video communications inc","product":"zoom on-premise recording connector"},{"vendor":"zoom video communications inc","product":"zoom on-premise virtual room connector"},{"vendor":"zoom video communications inc","product":"zoom on-premise virtual room connector load balancer"}],"references":[{"url":"https://explore.zoom.us/en/trust/security/security-bulletin","tags":["x_refsource_MISC","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-34418"},{"url":"https://github.com/advisories/GHSA-9m9w-fffc-45mm"}],"sources":{"cve":[{"id":"CVE-2021-34418","title":"Pre-auth Null pointer crash in on-premise web console","description":"The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.","status":"published","published":"2021-11-11T22:59:47.92Z","modified":"2024-09-16T22:14:22.064Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"updated_at":"2026-11-02T14:33:11.244759Z"}],"euvd":[{"id":"EUVD-2021-21076","description":"The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.","status":"published","published":"2021-11-11T22:59:47Z","modified":"2024-09-16T22:14:22Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-03T00:55:04.822795Z"}],"ghsa":[{"id":"GHSA-9m9w-fffc-45mm","title":"The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6...","description":"The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.","status":"published","published":"2022-05-24T19:20:36Z","modified":"2023-01-30T05:03:35Z","cwes":["CWE-476"],"updated_at":"2026-11-02T14:46:52.374347Z"}],"nvd":[{"id":"CVE-2021-34418","description":"The login routine of the web console in the Zoom On-Premise Meeting Connector before version 4.6.239.20200613, Zoom On-Premise Meeting Connector MMR before version 4.6.239.20200613, Zoom On-Premise Recording Connector before version 3.8.42.20200905, Zoom On-Premise Virtual Room Connector before version 4.4.6344.20200612, and Zoom On-Premise Virtual Room Connector Load Balancer before version 2.5.5492.20200616 fails to validate that a NULL byte was sent while authenticating. This could lead to a crash of the login service.","status":"published","published":"2021-11-11T23:15:09.467Z","modified":"2026-06-17T03:55:49.123Z","cvss":[{"version":"3.1","score":4,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"},{"version":"2.0","score":5,"vector":"AV:N/AC:L/Au:N/C:N/I:N/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-476"],"updated_at":"2026-11-02T14:07:00.984108Z"}]}}