{"id":"CVE-2023-27991","state":"PUBLISHED","title":"The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5","description":"The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware versions 4.16 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could allow an authenticated attacker to execute some OS commands remotely.","publishedAt":"2023-04-24T00:00:00.000Z","updatedAt":"2025-02-04T16:47:55.646Z","severity":{"score":8.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Zyxel"},"assigner":"Zyxel","products":["Zyxel ATP series firmware","Zyxel USG FLEX series firmware","Zyxel USG FLEX 50(W) firmware","Zyxel USG20(W)-VPN firmware","Zyxel VPN series firmware"],"affected":[{"vendor":"Zyxel","product":"ATP series firmware","versions":[{"version":"4.32 through 5.35","status":"affected"}]},{"vendor":"Zyxel","product":"USG FLEX series firmware","versions":[{"version":"4.50 through 5.35","status":"affected"}]},{"vendor":"Zyxel","product":"USG FLEX 50(W) firmware","versions":[{"version":"4.16 through 5.35","status":"affected"}]},{"vendor":"Zyxel","product":"USG20(W)-VPN firmware","versions":[{"version":"4.16 through 5.35","status":"affected"}]},{"vendor":"Zyxel","product":"VPN series firmware","versions":[{"version":"4.30 through 5.35","status":"affected"}]}],"references":["https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls"],"weaknesses":["CWE-78"],"ingestedAt":"2026-10-29T20:05:52.290Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/27xxx/CVE-2023-27991.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-27991","state":"PUBLISHED","datePublished":"2023-04-24T00:00:00.000Z","dateUpdated":"2025-02-04T16:47:55.646Z","assignerShortName":"Zyxel","assignerOrgId":"96e50032-ad0d-4058-a115-4d2c13821f9f","dateReserved":"2023-03-09T00:00:00.000Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG 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