Security advisory

{
  "id": "99a8a4a9f967b178d2559ef6027ac9fac675a7a242cdc6deac6f012a01a5a02c",
  "url": "https://osv.dev/vulnerability/CVE-2018-15919",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-15919",
    "summary": "Remotely observable behaviour in auth-gss2.c in OpenSSH through 7.8 could be used by remote attackers to detect existence of users on a target system when GSS2 is in use. NOTE: the discoverer states 'We understand that the OpenSSH developers do not want to treat such a username enumeration (or \"oracle\") as a vulnerability.'",
    "evidence": "osv:CVE-2018-15919",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2018-15919",
      "aliases": [
        "CVE-2018-15919"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openssh/openssh-portable",
              "type": "GIT",
              "events": [
                {
                  "introduced": "5643cf0fc4d71e783c6aef2574684f07d21945ab"
                },
                {
                  "last_affected": "71508e06fab14bc415a79a08f5535ad7bffa93d9"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.9"
                      },
                      {
                        "last_affected": "7.8"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-15919.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:27.318302394Z",
      "provider": "osv",
      "references": [
        "https://security.netapp.com/advisory/ntap-20181221-0001/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-15919",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 431804,
  "published_at": "2018-08-28T08:29:00.207+00:00"
}