{"id":"CVE-2023-27991","aliases":["EUVD-2023-31716","GHSA-2j4f-52m8-xq9h"],"status":"published","title":"The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series...","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.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.01453,"percentile":0.73762,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-78"],"published":"2023-04-24T00:00:00Z","modified":"2026-06-17T05:46:19Z","products":[{"vendor":"zyxel","product":"atp series firmware"},{"vendor":"zyxel","product":"atp100_firmware"},{"vendor":"zyxel","product":"atp100w_firmware"},{"vendor":"zyxel","product":"atp200_firmware"},{"vendor":"zyxel","product":"atp500_firmware"},{"vendor":"zyxel","product":"atp700_firmware"},{"vendor":"zyxel","product":"atp800_firmware"},{"vendor":"zyxel","product":"usg flex 50(w) firmware"},{"vendor":"zyxel","product":"usg flex series firmware"},{"vendor":"zyxel","product":"usg20(w)-vpn firmware"},{"vendor":"zyxel","product":"usg20-vpn_firmware"},{"vendor":"zyxel","product":"usg_20w-vpn_firmware"},{"vendor":"zyxel","product":"usg_flex_100_firmware"},{"vendor":"zyxel","product":"usg_flex_100w_firmware"},{"vendor":"zyxel","product":"usg_flex_200_firmware"},{"vendor":"zyxel","product":"usg_flex_500_firmware"},{"vendor":"zyxel","product":"usg_flex_50_firmware"},{"vendor":"zyxel","product":"usg_flex_50w_firmware"},{"vendor":"zyxel","product":"usg_flex_700_firmware"},{"vendor":"zyxel","product":"vpn series firmware"},{"vendor":"zyxel","product":"vpn1000_firmware"},{"vendor":"zyxel","product":"vpn100_firmware"},{"vendor":"zyxel","product":"vpn300_firmware"},{"vendor":"zyxel","product":"vpn50_firmware"}],"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-xss-vulnerability-and-post-authentication-command-injection-vulnerability-in-firewalls","tags":["x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27991"},{"url":"https://github.com/advisories/GHSA-2j4f-52m8-xq9h"}],"sources":{"cve":[{"id":"CVE-2023-27991","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.","status":"published","published":"2023-04-24T00:00:00Z","modified":"2025-02-04T16:47:55.646Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:35:26.261013Z"}],"euvd":[{"id":"EUVD-2023-31716","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.","status":"published","published":"2023-04-24T00:00:00Z","modified":"2025-02-04T16:47:55Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:04:06.358066Z"}],"ghsa":[{"id":"GHSA-2j4f-52m8-xq9h","title":"The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series...","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.","status":"published","published":"2023-04-24T18:30:31Z","modified":"2024-04-04T03:39:49Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:56:16.933961Z"}],"nvd":[{"id":"CVE-2023-27991","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.","status":"published","published":"2023-04-24T18:15:09.497Z","modified":"2026-06-17T05:46:19.873Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"},{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:07:56.683259Z"}]}}