{"id":"CVE-2024-21899","url":"https://www.cyber-defence.io/tools/cve/CVE-2024-21899","generatedAt":"2026-11-04T22:12:40.972Z","title":"An improper authentication vulnerability has been reported to affect several QNAP operating system versions.","description":"An improper authentication vulnerability has been reported to affect several QNAP operating system versions. If exploited, the vulnerability could allow users to compromise the security of the system via a network.\n\nWe have already fixed the vulnerability in the following versions:\nQTS 5.1.3.2578 build 20231110 and later\nQTS 4.5.4.2627 build 20231225 and later\nQuTS hero h5.1.3.2578 build 20231110 and later\nQuTS hero h4.5.4.2626 build 20231225 and later\nQuTScloud c5.1.5.2651 and later\n","published":"2024-03-08T17:15:23.000Z","lastModified":"2026-06-17T07:10:22.000Z","status":"Modified","sourceIdentifier":"security@qnapsecurity.com.tw","cvss":{"version":"3.1","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-287"],"affected":["qnap/qts","qnap/quts hero","qnap/qutscloud"],"epss":{"score":0.24365,"percentile":0.9787,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 24.4%, higher than 98% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://www.qnap.com/en/security-advisory/qsa-24-09","tags":["Vendor Advisory"],"source":"security@qnapsecurity.com.tw"},{"url":"https://www.qnap.com/en/security-advisory/qsa-24-09","tags":["Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2024-21899","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}