{"id":"CVE-2020-15813","details":"Graylog before 3.3.3 lacks SSL Certificate Validation for LDAP servers. It allows use of an external user/group database stored in LDAP. The connection configuration allows the usage of unencrypted, SSL- or TLS-secured connections. Unfortunately, the Graylog client code (in all versions that support LDAP) does not implement proper certificate validation (regardless of whether the \"Allow self-signed certificates\" option is used). Therefore, any attacker with the ability to intercept network traffic between a Graylog server and an LDAP server is able to redirect traffic to a different LDAP server (unnoticed by the Graylog server due to the lack of certificate validation), effectively bypassing Graylog's authentication mechanism.","aliases":["GHSA-3gg9-f3vh-866f"],"modified":"2026-08-07T15:11:48.899793Z","published":"2020-07-17T19:15:12.547Z","references":[{"type":"ADVISORY","url":"https://github.com/Graylog2/graylog2-server/issues/5906"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/graylog2/graylog2-server","events":[{"introduced":"0"},{"fixed":"88d0659e1ccef646a42ffa24dead9615b6d3e77e"}],"database_specific":{"cpe":"cpe:2.3:a:graylog:graylog:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"3.3.3"}],"source":"CPE_RANGE"}}],"versions":["3.3.2","3.3.1","3.3.0","3.3.0-rc.1","3.3.0-beta.3","3.3.0-beta.2","3.3.0-beta.1","3.2.0-rc.1","3.2.0-beta.4","3.2.0-beta.3","3.2.0-beta.2","3.2.0-beta.1","3.1.0","3.1.0-rc.2","3.1.0-rc.1","3.1.0-beta.3","3.1.0-beta.2","3.1.0-beta.1","3.0.0-beta.1","3.0.0-alpha.5","3.0.0-alpha.4","3.0.0-alpha.3","3.0.0-alpha.2","3.0.0-alpha.1","3.0.0-alpha.0","2.4.0-alpha.3","2.4.0-alpha.2","2.4.0-alpha.1","2.3.0-rc.1","2.3.0-beta.1","2.3.0-alpha.3","2.3.0-alpha.2","2.3.0-alpha.1","2.2.0","2.2.0-rc.1","2.2.0-beta.6","2.2.0-beta.5","2.2.0-beta.4","2.2.0-beta.3","2.2.0-beta.2","2.2.0-beta.1","2.2.0-alpha.4","2.2.0-alpha.3","2.2.0-alpha.2","2.2.0-alpha.1","2.1.0-rc.1","2.1.0-beta.4","2.1.0-beta.3","2.1.0-beta.2","2.1.0-beta.1","2.1.0-alpha.2","2.1.0-alpha.1","2.0.0-beta.3","2.0.0-beta.2","2.0.0-beta.1","2.0.0-alpha.5","2.0.0-alpha.4","2.0.0-alpha.3","2.0.0-alpha.2","2.0.0-alpha.1","1.2.0-rc.4","1.2.0-rc.3","1.2.0-rc.2","1.2.0-rc.1","1.1.0-rc.1","1.1.0-beta.3","1.1.0-beta.2","1.1.0-beta.1","1.0.0-beta.1","0.21.0-rc.1","0.21.0-beta4","0.21.0-beta3","0.21.0-beta2","0.21.0-beta1","v0.20.0-rc.1-1","0.20.0-rc.1-1","0.20.0-rc.1","0.20.0-preview.6","0.20.0-preview.5","0.20.0-preview.4","0.20.0-preview.3","0.20.0-preview.2","v0.20.0-preview.1","0.20.0-preview.1","0.11.0","0.10.0","0.10.0-rc.4","0.10.0-rc.3","0.10.0-rc.2","0.10.0-rc.1","0.10.0-preview.2","0.9.7-preview.1","0.9.6","0.9.6-beta","0.9.6-PREVIEW.3","0.9.6-PREVIEW.2","0.9.6-PREVIEW","0.9.5p1","0.9.5","0.9.4p1","0.9.4","0.9.3","0.9.2","0.9.1","0.9"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-15813.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}