Security advisory

{
  "id": "560e4b5cd63d42e5611e43414c5f820d4e271a85699011179146c21420a7b495",
  "url": "https://osv.dev/vulnerability/CVE-2020-8138",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8138",
    "summary": "A missing check for IPv4 nested inside IPv6 in Nextcloud server < 17.0.1, < 16.0.7, and < 15.0.14 allowed a Server-Side Request Forgery (SSRF) vulnerability when subscribing to a malicious calendar URL.",
    "evidence": "osv:CVE-2020-8138",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-8138",
      "aliases": [
        "CVE-2020-8138"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/nextcloud/server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "dd0b38876d11d81776c9e12bdcc31142059a983e"
                },
                {
                  "introduced": "6781f9fc7652f735a75abd869ab3e79878fceec9"
                },
                {
                  "fixed": "afa23942a508c16dc99bf6031d522a4d9539bb3a"
                },
                {
                  "introduced": "c937c8f1753b111086e28afa396f3abd5776b1db"
                },
                {
                  "fixed": "8306acc940c0c8d4c0c3798b742d6ca8be3fcff0"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "15.0.14"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "16.0.0"
                      },
                      {
                        "fixed": "16.0.7"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "17.0.0"
                      },
                      {
                        "fixed": "17.0.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v15.0.14RC1",
            "v16.0.7RC1",
            "v17.0.2RC1",
            "v17.0.1",
            "v15.0.13",
            "v16.0.6",
            "v15.0.13rc1",
            "v16.0.6rc1",
            "v17.0.1rc1",
            "v17.0.0",
            "v15.0.12",
            "v16.0.5",
            "v16.0.5RC1",
            "v15.0.12RC1",
            "v15.0.11",
            "15.0.11",
            "v16.0.4",
            "16.0.4",
            "v15.0.11RC1",
            "v16.0.4RC1",
            "v15.0.10",
            "v16.0.3",
            "v16.0.2",
            "v15.0.9",
            "v15.0.9RC1",
            "v16.0.2RC1",
            "v16.0.1",
            "v15.0.8",
            "v16.0.1RC1",
            "v15.0.8RC1",
            "v16.0.0",
            "v15.0.7",
            "v15.0.6",
            "v15.0.6RC1",
            "v15.0.5",
            "v15.0.5RC2",
            "v15.0.5RC1",
            "v15.0.4",
            "v15.0.3",
            "v15.0.3RC1",
            "v15.0.2",
            "v15.0.1RC1",
            "v15.0.1",
            "v15.0.1RC2",
            "v15.0.0",
            "v15.0.0RC3",
            "v15.0.0RC2",
            "v15.0.0RC1",
            "v15.0.0beta2",
            "v15.0.0beta1",
            "v14.0.0RC2",
            "v14.0.0RC1",
            "v14.0.0beta4",
            "v14.0.0beta3",
            "v14.0.0beta2",
            "v14.0.0beta1",
            "v13.0.0RC1",
            "v13.0.0beta4",
            "v13.0.0beta3",
            "v13.0.0beta2",
            "v13.0.0beta1",
            "v12.0.0beta4",
            "v12.0.0beta3",
            "v12.0.0beta2",
            "v12.0.0beta1",
            "v11.0.0",
            "v11.0RC2",
            "v9.1.0beta1",
            "v9.0.0beta2",
            "v9.0beta1",
            "v8.2RC1",
            "v8.2beta1",
            "v8.1RC2",
            "v8.1.0beta2",
            "v8.1.0beta1",
            "v8.1.0alpha2",
            "v8.1.0alpha1",
            "v8.0.0",
            "v8.0.0RC2",
            "v8.0.0RC1",
            "v8.0.0beta2",
            "v8.0.0beta1",
            "v8.0.0alpha2",
            "v8.0.0alpha1",
            "v7.0.0beta1",
            "v7.0.0alpha2",
            "v6.0.0RC2",
            "v6.0.0RC1",
            "v6.0.0beta5",
            "v6.0.0beta4",
            "v6.0.0beta3",
            "v6.0.0beta2",
            "v6.0.0alpha2",
            "v5.0.0",
            "v5.0.0RC3",
            "v5.0.0RC2",
            "v5.0.0RC1",
            "v5.0.0beta2",
            "v5.0.0beta1",
            "v5.0.0alpha1",
            "v4.5.0",
            "v4.5.0RC3",
            "v4.5.0RC2",
            "v4.5.0RC1",
            "v4.5.0beta4",
            "v4.5.0beta3",
            "v4.0.6",
            "v4.0.5",
            "v4.0.4",
            "v4.0.1",
            "v4.0.0",
            "v4.0.0RC2",
            "v4.0.0RC",
            "v4.0.0beta",
            "v3.0",
            "v1.0.0beta1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8138.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:16.431600759Z",
      "provider": "osv",
      "references": [
        "https://nextcloud.com/security/advisory/?id=NC-SA-2020-014",
        "https://hackerone.com/reports/736867"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-8138",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 429351,
  "published_at": "2020-03-20T21:15:17.547+00:00"
}