SSH public key login without private key challenge if mfa is enabled in jumpserver

{
  "id": "54dc3f14673cae3943846a402637eea1100be56c07a9d7d4ee72c04bed75935b",
  "url": "https://osv.dev/vulnerability/CVE-2023-42818",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "SSH public key login without private key challenge if mfa is enabled in jumpserver",
    "summary": "JumpServer is an open source bastion host. When users enable MFA and use a public key for authentication, the Koko SSH server does not verify the corresponding SSH private key. An attacker could exploit a vulnerability by utilizing a disclosed public key to attempt brute-force authentication against the SSH service This issue has been patched in versions 3.6.5 and 3.5.6. Users are advised to upgrade. There are no known workarounds for this issue.",
    "evidence": "osv:CVE-2023-42818",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2023-42818",
      "aliases": [
        "CVE-2023-42818",
        "GHSA-jv3c-27cv-w8jv",
        "GO-2025-3570"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/jumpserver/jumpserver",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "1b157a107e15dc4eb5bca689f90a98333429c1ae"
                },
                {
                  "introduced": "cb11cb17742377ea9baba8d9d4301306b9de7f51"
                },
                {
                  "fixed": "811d64be69c242719be21275f29558cb12671e77"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "3.5.6"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:fit2cloud:jumpserver:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "3.6.0"
                      },
                      {
                        "fixed": "3.6.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.27.0",
            "v2.26.0",
            "v2.25.0",
            "v2.24.0",
            "v2.23.0",
            "v2.22.0",
            "v2.21.0",
            "v2.20.0",
            "v2.19.0",
            "v2.18.1",
            "v2.18.0",
            "v2.17.0",
            "v2.15.1",
            "v2.15.0",
            "v2.13.0",
            "v2.12.0",
            "v2.11.0",
            "v2.10.0",
            "v2.9.0",
            "v2.8.0",
            "v2.7.0",
            "v2.6.0",
            "v2.5.0",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0",
            "v2.2.1",
            "v2.2.0",
            "v2.1.0",
            "1.5.9",
            "1.5.8",
            "1.5.7",
            "1.5.6",
            "1.5.5",
            "1.5.4",
            "1.5.3",
            "1.5.2",
            "1.5.1",
            "1.5.0",
            "v1.4.10",
            "1.4.10",
            "1.4.9",
            "1.4.8",
            "1.4.7",
            "v1.4.7",
            "1.4.6",
            "1.4.5",
            "1.4.4",
            "v1.4.4",
            "1.4.3",
            "1.4.2",
            "1.4.1",
            "1.4.0",
            "1.3.3",
            "1.3.2",
            "1.3.1",
            "1.3.0",
            "1.2.1",
            "1.2.0",
            "1.1.1",
            "1.1.0",
            "1.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-42818.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:38.396385469Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/42xxx/CVE-2023-42818.json",
        "https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-42818",
        "https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-287"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/42xxx/CVE-2023-42818.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-42818",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 505601,
  "published_at": "2023-09-27T20:28:30.507+00:00"
}