{"id":"CVE-2023-34139","aliases":["EUVD-2023-38241","GHSA-xjxm-x67w-v3c7"],"status":"published","title":"A command injection vulnerability in the Free Time WiFi hotspot feature of in the Zyxel USG FLEX...","description":"A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00759,"percentile":0.55565,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-78"],"published":"2023-07-17T17:36:32Z","modified":"2026-06-17T06:02:58Z","products":[{"vendor":"zyxel","product":"usg flex series firmware"},{"vendor":"zyxel","product":"usg_2200-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":"usg_flex_firmware"},{"vendor":"zyxel","product":"vpn series firmware"},{"vendor":"zyxel","product":"vpn_firmware"},{"vendor":"zyxel","product":"zywall_vpn100_firmware"},{"vendor":"zyxel","product":"zywall_vpn2s_firmware"},{"vendor":"zyxel","product":"zywall_vpn300_firmware"},{"vendor":"zyxel","product":"zywall_vpn50_firmware"},{"vendor":"zyxel","product":"zywall_vpn_100_firmware"},{"vendor":"zyxel","product":"zywall_vpn_300_firmware"},{"vendor":"zyxel","product":"zywall_vpn_50_firmware"}],"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers","tags":["vendor-advisory","x_transferred","Vendor Advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-34139"},{"url":"https://github.com/advisories/GHSA-xjxm-x67w-v3c7"}],"sources":{"cve":[{"id":"CVE-2023-34139","description":"A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.","status":"published","published":"2023-07-17T17:36:32.909Z","modified":"2024-10-29T16:19:03.216Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:35:35.912488Z"}],"euvd":[{"id":"EUVD-2023-38241","description":"A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.","status":"published","published":"2023-07-17T17:36:32Z","modified":"2024-10-29T16:19:03Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T00:05:15.24326Z"}],"ghsa":[{"id":"GHSA-xjxm-x67w-v3c7","title":"A command injection vulnerability in the Free Time WiFi hotspot feature of in the Zyxel USG FLEX...","description":"A command injection vulnerability in the Free Time WiFi hotspot feature of in the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.","status":"published","published":"2023-07-17T18:31:28Z","modified":"2024-04-04T06:11:26Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:56:39.852376Z"}],"nvd":[{"id":"CVE-2023-34139","description":"A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device.","status":"published","published":"2023-07-17T18:15:09.607Z","modified":"2026-06-17T06:02:58.81Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:A/AC:L/PR:N/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:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-78"],"updated_at":"2026-11-02T14:08:17.044696Z"}]}}