{"id":"CVE-2020-27648","aliases":["EUVD-2020-20155","GHSA-f7vf-74cx-834m"],"status":"published","title":"Improper certificate validation vulnerability in OpenVPN client in Synology DiskStation Manager ...","description":"Improper certificate validation vulnerability in OpenVPN client in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.","severity":{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00719,"percentile":0.54226,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-295"],"published":"2020-10-29T09:00:25Z","modified":"2026-06-17T03:09:25Z","products":[{"vendor":"synology","product":"diskstation manager (dsm)"},{"vendor":"synology","product":"diskstation_manager"},{"vendor":"synology","product":"skynas_firmware"}],"references":[{"url":"https://www.synology.com/security/advisory/Synology_SA_20_18","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1058","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2020-27648"},{"url":"https://github.com/advisories/GHSA-f7vf-74cx-834m"}],"sources":{"cve":[{"id":"CVE-2020-27648","description":"Improper certificate validation vulnerability in OpenVPN client in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.","status":"published","published":"2020-10-29T09:00:25.133Z","modified":"2024-09-16T20:27:27.929Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:35:53.552996Z"}],"euvd":[{"id":"EUVD-2020-20155","description":"Improper certificate validation vulnerability in OpenVPN client in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.","status":"published","published":"2020-10-29T09:00:25Z","modified":"2024-09-16T20:27:27Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:55:14.02226Z"}],"ghsa":[{"id":"GHSA-f7vf-74cx-834m","title":"Improper certificate validation vulnerability in OpenVPN client in Synology DiskStation Manager ...","description":"Improper certificate validation vulnerability in OpenVPN client in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.","status":"published","published":"2022-05-24T17:32:35Z","modified":"2025-01-14T21:32:48Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:59:31.794566Z"}],"nvd":[{"id":"CVE-2020-27648","description":"Improper certificate validation vulnerability in OpenVPN client in Synology DiskStation Manager (DSM) before 6.2.3-25426-2 allows man-in-the-middle attackers to spoof servers and obtain sensitive information via a crafted certificate.","status":"published","published":"2020-10-29T09:15:12.573Z","modified":"2026-06-17T03:09:25.913Z","cvss":[{"version":"3.1","score":8.3,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":6.8,"vector":"AV:N/AC:M/Au:N/C:P/I:P/A:P","level":"medium","assessor":"primary"}],"cwes":["CWE-295"],"updated_at":"2026-11-02T14:06:21.80969Z"}]}}