{"id":"CVE-2025-66277","aliases":["EUVD-2025-207017","GHSA-3wh2-2wc5-f45w"],"status":"published","title":"QTS, QuTS hero","description":"A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.2.8.3350 build 20251216 and later\nQuTS hero h5.3.2.3354 build 20251225 and later\nQuTS hero h5.2.8.3350 build 20251216 and later","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00702,"percentile":0.53531,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-59"],"published":"2026-02-11T12:15:43Z","modified":"2026-06-17T09:56:35Z","products":[{"vendor":"qnap","product":"qts"},{"vendor":"qnap","product":"quts_hero"},{"vendor":"qnap systems inc.","product":"qts"},{"vendor":"qnap systems inc.","product":"quts hero"}],"references":[{"url":"https://www.qnap.com/en/security-advisory/qsa-26-05","tags":["Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66277"},{"url":"https://github.com/advisories/GHSA-3wh2-2wc5-f45w"}],"sources":{"cve":[{"id":"CVE-2025-66277","title":"QTS, QuTS hero","description":"A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.2.8.3350 build 20251216 and later\nQuTS hero h5.3.2.3354 build 20251225 and later\nQuTS hero h5.2.8.3350 build 20251216 and later","status":"published","published":"2026-02-11T12:15:43.851Z","modified":"2026-02-26T14:44:26.986Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T14:32:53.157279Z"}],"euvd":[{"id":"EUVD-2025-207017","description":"A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.2.8.3350 build 20251216 and later\nQuTS hero h5.3.2.3354 build 20251225 and later\nQuTS hero h5.2.8.3350 build 20251216 and later","status":"published","published":"2026-02-11T12:15:43Z","modified":"2026-02-26T14:44:26Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-02T19:48:27.477434Z"}],"ghsa":[{"id":"GHSA-3wh2-2wc5-f45w","title":"A link following vulnerability has been reported to affect several QNAP operating system versions...","description":"A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.2.8.3350 build 20251216 and later\nQuTS hero h5.3.2.3354 build 20251225 and later\nQuTS hero h5.2.8.3350 build 20251216 and later","status":"published","published":"2026-02-11T15:30:26Z","modified":"2026-02-12T18:30:21Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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","level":"critical"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T15:06:11.04945Z"}],"nvd":[{"id":"CVE-2025-66277","description":"A link following vulnerability has been reported to affect several QNAP operating system versions. The remote attackers can then exploit the vulnerability to traverse the file system to unintended locations.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.2.8.3350 build 20251216 and later\nQuTS hero h5.3.2.3354 build 20251225 and later\nQuTS hero h5.2.8.3350 build 20251216 and later","status":"published","published":"2026-02-11T13:15:58.38Z","modified":"2026-06-17T09:56:35.993Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/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","level":"critical","assessor":"secondary"},{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T14:12:00.273026Z"}]}}