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High

Security advisory

Type: advisorySources: OSVCVE: CVE-2020-15813

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2020-15813
Confirmed fixed CVEs
Not specified
Updated in this feed
31 Oct 2026, 10:53 UTC · Revision 1

Source evidence

CVE-2020-15813

core-osv · Original source

Published 17 Jul 2020, 19:15 UTC

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.

osv:CVE-2020-15813
Complete source record
{
  "id": "f2d241c1ca8364a32ea1c3654c1aa3c54bef1d1cee698ee703205d71f50ec93b",
  "url": "https://osv.dev/vulnerability/CVE-2020-15813",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-15813",
    "summary": "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.",
    "evidence": "osv:CVE-2020-15813",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-15813",
      "aliases": [
        "CVE-2020-15813",
        "GHSA-3gg9-f3vh-866f"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/graylog2/graylog2-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "88d0659e1ccef646a42ffa24dead9615b6d3e77e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:graylog:graylog:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "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"
          }
        }
      ],
      "modified": "2026-10-20T10:51:56.282075207Z",
      "provider": "osv",
      "references": [
        "https://github.com/Graylog2/graylog2-server/issues/5906"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-15813",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 383141,
  "published_at": "2020-07-17T19:15:12.547+00:00"
}