{"id":"CVE-2023-27992","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-27992","generatedAt":"2026-10-31T11:45:22.594Z","title":"Zyxel Multiple NAS Devices Command Injection Vulnerability","description":"The pre-authentication command injection vulnerability in the Zyxel NAS326 firmware versions prior to V5.21(AAZF.14)C0, NAS540 firmware versions prior to V5.21(AATB.11)C0, and NAS542 firmware versions prior to V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands remotely by sending a crafted HTTP request.","published":"2023-06-19T12:15:09.000Z","lastModified":"2026-06-17T05:46:20.000Z","status":"Analyzed","sourceIdentifier":"security@zyxel.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-78"],"affected":["zyxel/nas326 firmware","zyxel/nas540 firmware","zyxel/nas542 firmware"],"epss":{"score":0.82264,"percentile":0.99658,"date":"2026-10-30","history":[]},"kev":{"listed":true,"dateAdded":"2023-06-23","dueDate":"2023-07-14","knownRansomwareCampaignUse":"Unknown","notes":"Apply updates per vendor instructions.\nhttps://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products;  https://nvd.nist.gov/vuln/detail/CVE-2023-27992"},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"Known to be exploited in the wild (CISA KEV, CISA remediation deadline 14 July 2023). Treat as an emergency change: patch or isolate now, then hunt for prior compromise."},"changes":[],"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products","tags":["Patch","Vendor Advisory"],"source":"security@zyxel.com.tw"},{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-pre-authentication-command-injection-vulnerability-in-nas-products","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-27992","tags":["US Government Resource"],"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-27992","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."}