{"id":"CVE-2021-26566","aliases":["EUVD-2021-13364","GHSA-x5fh-xfvr-gg7m"],"status":"published","title":"Insertion of sensitive information into sent data vulnerability in synorelayd in Synology...","description":"Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.","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":"2026-11-12","score":0.01508,"percentile":0.74773,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-200","CWE-201"],"published":"2021-02-26T21:45:35Z","modified":"2026-06-17T03:43:29Z","products":[{"vendor":"synology","product":"diskstation_manager"},{"vendor":"synology","product":"diskstation_manager_unified_controller"},{"vendor":"synology","product":"skynas_firmware"},{"vendor":"synology","product":"synology diskstation manager (dsm)"},{"vendor":"synology","product":"vs960hd_firmware"}],"references":[{"url":"https://www.synology.com/security/advisory/Synology_SA_20_26","tags":["x_refsource_CONFIRM","x_transferred","Vendor Advisory"]},{"url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1160","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26566"},{"url":"https://github.com/advisories/GHSA-x5fh-xfvr-gg7m"}],"sources":{"cve":[{"id":"CVE-2021-26566","description":"Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.","status":"published","published":"2021-02-26T21:45:35.118Z","modified":"2024-09-17T03:23:15.693Z","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-201"],"updated_at":"2026-11-02T14:32:57.368269Z"}],"euvd":[{"id":"EUVD-2021-13364","description":"Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.","status":"published","published":"2021-02-26T21:45:35Z","modified":"2024-09-17T03:23:15Z","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":"2026-11-03T00:28:32.08327Z"}],"ghsa":[{"id":"GHSA-x5fh-xfvr-gg7m","title":"Insertion of sensitive information into sent data vulnerability in synorelayd in Synology...","description":"Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.","status":"published","published":"2022-05-24T17:43:20Z","modified":"2025-01-14T21:31:42Z","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-200","CWE-201"],"updated_at":"2026-11-02T14:59:31.794566Z"}],"nvd":[{"id":"CVE-2021-26566","description":"Insertion of sensitive information into sent data vulnerability in synorelayd in Synology DiskStation Manager (DSM) before 6.2.3-25426-3 allows man-in-the-middle attackers to execute arbitrary commands via inbound QuickConnect traffic.","status":"published","published":"2021-02-26T22:15:20.567Z","modified":"2026-06-17T03:43:29.4Z","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-201","CWE-200"],"updated_at":"2026-11-02T14:06:50.399901Z"}]}}