{"schemaVersion":3,"id":"CVE-2025-66281","aliases":[],"status":"published","duplicateOf":null,"title":"QTS, QuTS hero","description":"A NULL pointer dereference vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to launch a denial-of-service (DoS) attack.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.2.9.3410 build 20260214 and later\nQuTS hero h5.2.9.3410 build 20260214 and later\nQuTS hero h5.3.4.3500 build 20260520 and later\nQuTS hero h6.0.0.3397 build 20260206 and later","dates":{"published":"2026-06-10T03:06:06.429Z","modified":"2026-06-10T15:50:06.023Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":7.2,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"NVD","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":6.9,"severity":"medium","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":7.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00456,"percentile":0.38612,"severity":"low","asOf":"2026-10-22T00:00:00.000Z","change":{"pp":0,"baselineDate":"2026-09-22T00:00:00.000Z","baselineScore":0.00456},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00456,"percentile":0.38612}],"last30":[{"date":"2026-09-22T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00456,"percentile":null},{"date":"2026-10-22T00:00:00.000Z","score":0.00456,"percentile":0.38612}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-476","name":"NULL Pointer Dereference","description":"The product dereferences a pointer that it expects to be valid but is NULL.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/476.html"}],"affected":[{"vendor":"qnap systems inc.","product":"qts","name":"QTS","label":"qts","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 5.2.0, < 5.2.9.3410 build 20260214","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 5.2.0, < 5.2.9.3410 build 20260214","eol":null,"hubHref":"/vendor/qnap_systems_inc/qts"},{"vendor":"qnap systems inc.","product":"quts hero","name":"QuTS hero","label":"quts hero","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ h5.2.0, < h5.2.9.3410 build 20260214","noFixRecorded":false,"fixedIn":null},{"text":"≥ h5.3.0, < h5.3.4.3500 build 20260520","noFixRecorded":false,"fixedIn":null},{"text":"≥ ?, < h6.0.0.3397 build 20260206","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ h5.2.0, < h5.2.9.3410 build 20260214 | ≥ h5.3.0, < h5.3.4.3500 build 20260520 | ≥ ?, < h6.0.0.3397 build 20260206","eol":null,"hubHref":"/vendor/qnap_systems_inc/quts_hero"},{"vendor":"qnap","product":"qts","name":"QTS","label":"qts","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ 5.2.0.2737, < 5.2.9.3410","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 5.2.0.2737, < 5.2.9.3410","eol":null,"hubHref":"/vendor/qnap/qts"},{"vendor":"qnap","product":"quts_hero","name":"quts hero","label":"quts_hero","ecosystem":null,"cpePart":"o","purl":null,"purlType":null,"versions":[{"text":"≥ h5.2.0.2737, < h5.2.9.3410","noFixRecorded":false,"fixedIn":null},{"text":"≥ h5.3.0.3115, < h5.3.4.3500","noFixRecorded":false,"fixedIn":null},{"text":"≥ h6.0.0.3324, < h6.0.0.3397","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ h5.2.0.2737, < h5.2.9.3410 | ≥ h5.3.0.3115, < h5.3.4.3500 | ≥ h6.0.0.3324, < h6.0.0.3397","eol":null,"hubHref":"/vendor/qnap/quts_hero"}],"affectedCount":4,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://www.qnap.com/en/security-advisory/qsa-26-10","label":"www.qnap.com/en/security-advisory/qsa-26-10","hostname":"www.qnap.com","tags":["Broken Link","Vendor Advisory"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-06-10T03:06:06.429Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-06-10T15:50:06.023Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":29,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T18:25:16.756Z","stale":false,"partial":false}}