{"cve":"CVE-2023-42818","nvd":{"published":"2023-09-27T21:15:10.173","modified":"2026-06-17T06:24:35.167","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":["CWE-307","CWE-287"],"references":["https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv","https://www.sonarsource.com/blog/diving-into-jumpserver-attackers-gateway-to-internal-networks-1-2","https://github.com/jumpserver/jumpserver/security/advisories/GHSA-jv3c-27cv-w8jv"],"products":["fit2cloud:jumpserver"],"source":"nvd","synced_at":"2026-10-19T21:39:34.467980132+00:00"},"epss":{"cve":"CVE-2023-42818","score":0.00675,"percentile":0.52191,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GO-2025-3570","url":"https://osv.dev/vulnerability/GO-2025-3570","summary":"SSH public key login without private key challenge if mfa is enabled in jumpserver in github.com/jumpserver/koko in github.com/jumpserver/jumpserver","modified":"2026-03-03T04:56:27.877919Z","packages":[{"ecosystem":"Go","name":"github.com/jumpserver/koko","purl":"pkg:golang/github.com/jumpserver/koko","ranges":["all versions"],"fixed":[]},{"ecosystem":"Go","name":"github.com/jumpserver/jumpserver","purl":"pkg:golang/github.com/jumpserver/jumpserver","ranges":["<3.5.6+incompatible",">=3.6.0+incompatible <3.6.5+incompatible"],"fixed":["3.5.6+incompatible","3.6.5+incompatible"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}