{"id":"CVE-2023-4473","published":"2023-11-30T01:40:09Z","modified":"2025-12-16T18:23:26Z","title":"A command injection vulnerability in the web server of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542…","vendor":"Zyxel","product":"NAS326 firmware","tier":"core","eol":null,"affectedVersions":[{"vendor":"Zyxel","product":"NAS326 firmware","versions":["V5.21(AAZF.14)C0"]},{"vendor":"Zyxel","product":"NAS542 firmware","versions":["V5.21(ABAG.11)C0"]}],"description":{"text":"A command injection vulnerability in the web server of the Zyxel NAS326 firmware version V5.21(AAZF.14)C0 and NAS542 firmware version V5.21(ABAG.11)C0 could allow an unauthenticated attacker to execute some operating system (OS) commands by sending a crafted URL to a vulnerable device.","provenance":"source","from":"CVE.org"},"summary":null,"cvss":{"score":9.8,"severity":"CRITICAL","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","provenance":"source","from":"CVE.org CNA"},"epss":{"score":0.41348,"percentile":0.98667,"date":"2026-10-29","provenance":"source"},"kev":null,"vulncheckKev":{"dateAdded":"2024-04-28","exploitedFirstSeen":"2024-04-28","ransomware":false,"evidence":[{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2024-04-28&host_type=src&vulnerability=cve-2023-4473","date":"2024-04-28"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2024-04-29&host_type=src&vulnerability=cve-2023-4473","date":"2024-04-29"},{"url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2024-04-30&host_type=src&vulnerability=cve-2023-4473","date":"2024-04-30"},{"url":"https://isc.sans.edu/diary/Another+Day+Another+NAS+Attacks+against+Zyxel+NAS326+devices+CVE20234473+CVE20234474/30884","date":"2024-04-30"},{"url":"https://blog.xlab.qianxin.com/rapperbot/","date":"2025-06-17"}],"evidenceTotal":5,"provenance":"source"},"exploited":true,"otx":{"pulseCount":2,"pulses":[{"name":"Индикаторы компрометации ботнета Mirai (обновление за 04.08.2025)","url":"https://otx.alienvault.com/pulse/689b4e2128ead1ff683d053b","created":"2025-08-12"},{"name":"Zombies never die: RapperBot botnet recent situation analysis.","url":"https://otx.alienvault.com/pulse/6853b2331234cf34faacb6e5","created":"2025-06-19"}],"provenance":"machine"},"cwes":[{"id":"CWE-78","name":"Improper Neutralization of Special Elements used in an OS Command"}],"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-authentication-bypass-and-command-injection-vulnerabilities-in-nas-products","tags":["vendor-advisory"]},{"url":"https://bugprove.com/knowledge-hub/cve-2023-4473-and-cve-2023-4474-authentication-bypass-and-multiple-blind-os-command-injection-vulnerabilities-in-zyxel-s-nas-326-devices/","tags":[]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2023-54328","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2023-54328","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":null,"exploitRefs":[],"flow":[],"timeline":[{"date":"2023-11-30","kind":"published","label":"Published (CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2023-4473","provenance":"source"},{"date":"2024-04-28","kind":"exploited-reported","label":"Exploitation first reported (VulnCheck KEV evidence)","url":"https://dashboard.shadowserver.org/statistics/honeypot/vulnerability/map/?day=2024-04-28&host_type=src&vulnerability=cve-2023-4473","provenance":"source"}],"speed":{"daysToPublicExploit":null,"firstExploitFrom":null,"daysToKev":null},"priority":{"score":62.7,"factors":[{"name":"In a KEV catalog","points":35.0,"detail":"listed in VulnCheck KEV"},{"name":"Recent KEV listing","points":0.0,"detail":"added 915 days ago"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.73,"detail":"percentile 0.9867"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":0.0,"detail":"none found"},{"name":"Mentioned in OTX pulses","points":1.08,"detail":"2 pulses"},{"name":"CVSS severity","points":6.86,"detail":"base score 9.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}