{"id":"CVE-2020-15813","aliases":["GHSA-3gg9-f3vh-866f"],"url":"https://o3.security/vulnerability/CVE-2020-15813","summary":"Improper Certificate Validation in Graylog","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.","published":"2020-07-17T19:15:12.547Z","modified":"2026-08-07T15:11:48.899793Z","cvss":{"score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"epss":{"score":0.00779,"percentile":0.52772,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.graylog:graylog-parent","fixedVersion":"3.3.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/Graylog2/graylog2-server/issues/5906"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-07T15:11:48.899793Z"}}