Security advisory

{
  "id": "edae0e8c0a0b033bb7c626053af8f17ec15e13d2f77a5b87abe8c3a7a34fb29e",
  "url": "https://osv.dev/vulnerability/CVE-2020-27178",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-27178",
    "summary": "Apereo CAS 5.3.x before 5.3.16, 6.x before 6.1.7.2, 6.2.x before 6.2.4, and 6.3.x before 6.3.0-RC4 mishandles secret keys with Google Authenticator for multifactor authentication.",
    "evidence": "osv:CVE-2020-27178",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2020-27178",
      "aliases": [
        "CVE-2020-27178",
        "GHSA-q39c-5vh5-vw2p"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/apereo/cas",
              "type": "GIT",
              "events": [
                {
                  "introduced": "78f69385c15757a7a75f4c514d00c421db3fd216"
                },
                {
                  "fixed": "4b89fab15ff580fc3481f4cbf3bb917bb9fe05c4"
                },
                {
                  "introduced": "f0987d714be32ac64ba9e7b5155733936757cf41"
                },
                {
                  "fixed": "3f56dfecbec53cd007e36631971dafd037a5a068"
                },
                {
                  "introduced": "461b3b0c421cee6ae6863b3e01f5bc34c748eae9"
                },
                {
                  "fixed": "60ba4cdd35a279ba8aae8922920099d314576500"
                },
                {
                  "introduced": "f4a6c1e6d9914f82c71486d49ad74c069be6eaa9"
                },
                {
                  "last_affected": "02c3d72085ded07b24cc3f05af402ae814dcdd40"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.3.0"
                      },
                      {
                        "fixed": "5.3.16"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.0.0"
                      },
                      {
                        "fixed": "6.1.7.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.2.0"
                      },
                      {
                        "fixed": "6.2.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:6.3.0:rc1:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.3.0-rc1"
                      },
                      {
                        "last_affected": "6.3.0-rc1"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:6.3.0:rc2:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.3.0-rc2"
                      },
                      {
                        "last_affected": "6.3.0-rc2"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:apereo:central_authentication_service:6.3.0:rc3:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "6.3.0-rc3"
                      },
                      {
                        "last_affected": "6.3.0-rc3"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "6.3.0-rc1",
            "6.3.0-rc2",
            "6.3.0-rc3",
            "v6.3.0-RC3",
            "v6.2.3",
            "v6.3.0-RC2",
            "v6.2.2",
            "6.3.0-RC1",
            "v6.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-27178.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:22.290349476Z",
      "provider": "osv",
      "references": [
        "https://apereo.github.io/2020/10/14/gauthvuln/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-27178",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 430645,
  "published_at": "2020-10-16T16:15:11.573+00:00"
}