{"id":"CVE-2021-4039","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-4039","generatedAt":"2026-11-05T00:35:56.717Z","title":"A command injection vulnerability in the web interface of the Zyxel NWA-1100-NH firmware could allow an attacker to execute arbitrary OS commands on the device.","description":"A command injection vulnerability in the web interface of the Zyxel NWA-1100-NH firmware could allow an attacker to execute arbitrary OS commands on the device.","published":"2022-03-01T07:15:08.000Z","lastModified":"2026-06-17T04:18:56.000Z","status":"Modified","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/nwa1100-nh firmware"],"epss":{"score":0.71048,"percentile":0.99406,"date":"2026-11-03","history":[]},"kev":{"listed":false},"exploits":{"count":1,"verified":false,"firstPublished":"2022-04-19","source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[{"edbId":50870,"kind":"exploit","title":"Zyxel NWA-1100-NH - Command Injection","url":"https://www.exploit-db.com/exploits/50870","sourceUrl":"https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/hardware/remote/50870.txt","file":"exploits/hardware/remote/50870.txt","published":"2022-04-19","added":"2022-04-19","updated":"2022-04-19","author":"Ahmed Alroky","type":"remote","platform":"hardware","port":null,"verified":false,"codes":["CVE-2021-4039"],"tags":null,"aliases":null,"applicationUrl":null,"screenshotUrl":null,"referenceUrl":null}]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 71.0%, higher than 99% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://packetstormsecurity.com/files/166752/Zyxel-NWA-1100-NH-Command-Injection.html","tags":["Exploit","Release Notes","Third Party Advisory","VDB Entry"],"source":"security@zyxel.com.tw"},{"url":"https://www.zyxel.com/support/OS-command-injection-vulnerability-of-NWA1100-NH-access-point.shtml","tags":["Patch","Vendor Advisory"],"source":"security@zyxel.com.tw"},{"url":"http://packetstormsecurity.com/files/166752/Zyxel-NWA-1100-NH-Command-Injection.html","tags":["Exploit","Release Notes","Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.zyxel.com/support/OS-command-injection-vulnerability-of-NWA1100-NH-access-point.shtml","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-4039","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."}