Security advisory

{
  "id": "ef32ce3ce4bc7a143fc0c73bb87331d6ae94024e064a2ef6ed6f75ede8a3c1ce",
  "url": "https://osv.dev/vulnerability/CVE-2020-14145",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-14145",
    "summary": "The client side in OpenSSH 5.7 through 8.4 has an Observable Discrepancy leading to an information leak in the algorithm negotiation. This allows man-in-the-middle attackers to target initial connection attempts (where no host key for the server has been cached by the client). NOTE: some reports state that 8.5 and 8.6 are also affected.",
    "evidence": "osv:CVE-2020-14145",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-14145",
      "aliases": [
        "CVE-2020-14145"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openssh/openssh-portable",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6f8f04b860765da07938bfe1fef017b00c3a3d55"
                },
                {
                  "fixed": "279261e1ea8150c7c64ab5fe7cb4a4ea17acbb29"
                },
                {
                  "introduced": "279261e1ea8150c7c64ab5fe7cb4a4ea17acbb29"
                },
                {
                  "last_affected": "e86968280e358e62649d268d41f698d64d0dc9fa"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "5.7"
                      },
                      {
                        "fixed": "8.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:openbsd:openssh:8.4:-:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.4-NA"
                      },
                      {
                        "last_affected": "8.4-NA"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:openbsd:openssh:8.5:-:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.5-NA"
                      },
                      {
                        "last_affected": "8.5-NA"
                      }
                    ],
                    "source": "CPE_STRING"
                  },
                  {
                    "cpe": "cpe:2.3:a:openbsd:openssh:8.6:-:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "8.6-NA"
                      },
                      {
                        "last_affected": "8.6-NA"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "8.4-NA",
            "8.5-NA",
            "8.6-NA",
            "V_8_2_P1",
            "V_8_1_P1",
            "V_8_0_P1",
            "V_7_9_P1",
            "V_7_8_P1",
            "V_7_7_P1",
            "V_7_6_P1",
            "V_7_5_P1",
            "V_7_4_P1",
            "V_7_3_P1",
            "V_7_2_P1",
            "V_7_1_P1",
            "V_7_0_P1",
            "V_6_9_P1",
            "V_6_8_P1",
            "V_6_6_P1",
            "V_6_5_P1",
            "V_6_2_P1",
            "V_6_1_P1",
            "V_6_0_P1",
            "V_5_7_P1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-14145.json"
          }
        }
      ],
      "modified": "2026-10-20T10:51:49.062474124Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-398330.html",
        "https://docs.ssh-mitm.at/CVE-2020-14145.html",
        "https://github.com/ssh-mitm/ssh-mitm/blob/master/ssh_proxy_server/plugins/session/cve202014145.py",
        "https://security.gentoo.org/glsa/202105-35",
        "https://security.netapp.com/advisory/ntap-20200709-0004/",
        "https://www.fzi.de/en/news/news/detail-en/artikel/fsa-2020-2-ausnutzung-eines-informationslecks-fuer-gezielte-mitm-angriffe-auf-ssh-clients/",
        "https://anongit.mindrot.org/openssh.git/commit/?id=b3855ff053f5078ec3d3c653cdaedefaa5fc362d",
        "https://github.com/openssh/openssh-portable/compare/V_8_3_P1...V_8_4_P1"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:netapp:active_iq_unified_manager:*:*:*:*:*:vmware_vsphere:*:*"
            ],
            "vendor_product": "netapp:active_iq_unified_manager",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "9.5"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-14145",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 382993,
  "published_at": "2020-06-29T18:15:11.94+00:00"
}