{"cve":{"cve_id":"CVE-2023-33011","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00303,"epss_percentile":0.21814,"epss_as_of":"2026-06-23","description":"A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2,  USG FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 5.10 through 5.36 Patch 2, and VPN series firmware versions 5.00 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands by using a crafted PPPoE configuration on an affected device when the cloud management mode is enabled.","published_at":"2023-07-17T17:15:45.876000Z","last_modified_at":null,"cvss_v3_score":8.8,"cvss_v3_vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvss_v3_severity":"HIGH","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"none","ssvc_automatable":false,"ssvc_technical_impact":"total","cwes":["CWE-134"],"nvd_references":["https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-29T01:31:23.274887Z"},"effective_severity":"HIGH","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"A","value_label":"Adjacent"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"H","value_label":"High"},{"metric":"I","name":"Integrity","value":"H","value_label":"High"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"zyxel","vendor_name":"Zyxel","product_slug":"atp-series-firmware","product_name":"ATP series firmware","version_start":"5.10 through 5.36 Patch 2","version_start_inclusive":true,"version_end":"5.10 through 5.36 Patch 2","version_end_inclusive":true,"cpe23_uri":"cve5:zyxel:atp-series-firmware:5.10 through 5.36 Patch 2:5.10 through 5.36 Patch 2"},{"vendor_slug":"zyxel","vendor_name":"Zyxel","product_slug":"usg20-w-vpn-series-firmware","product_name":"USG20(W)-VPN series firmware","version_start":"5.10 through 5.36 Patch 2","version_start_inclusive":true,"version_end":"5.10 through 5.36 Patch 2","version_end_inclusive":true,"cpe23_uri":"cve5:zyxel:usg20-w-vpn-series-firmware:5.10 through 5.36 Patch 2:5.10 through 5.36 Patch 2"},{"vendor_slug":"zyxel","vendor_name":"Zyxel","product_slug":"usg-flex-50-w-series-firmware","product_name":"USG FLEX 50(W) series firmware","version_start":"5.10 through 5.36 Patch 2","version_start_inclusive":true,"version_end":"5.10 through 5.36 Patch 2","version_end_inclusive":true,"cpe23_uri":"cve5:zyxel:usg-flex-50-w-series-firmware:5.10 through 5.36 Patch 2:5.10 through 5.36 Patch 2"},{"vendor_slug":"zyxel","vendor_name":"Zyxel","product_slug":"usg-flex-series-firmware","product_name":"USG FLEX series firmware","version_start":"5.00 through 5.36 Patch 2","version_start_inclusive":true,"version_end":"5.00 through 5.36 Patch 2","version_end_inclusive":true,"cpe23_uri":"cve5:zyxel:usg-flex-series-firmware:5.00 through 5.36 Patch 2:5.00 through 5.36 Patch 2"},{"vendor_slug":"zyxel","vendor_name":"Zyxel","product_slug":"vpn-series-firmware","product_name":"VPN series firmware","version_start":"5.00 through 5.36 Patch 2","version_start_inclusive":true,"version_end":"5.00 through 5.36 Patch 2","version_end_inclusive":true,"cpe23_uri":"cve5:zyxel:vpn-series-firmware:5.00 through 5.36 Patch 2:5.00 through 5.36 Patch 2"}],"exploit_refs":[],"news":[],"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers","source_type":"VENDOR_ADVISORY","tags":["advisory"]}],"timeline":[{"type":"published","at":"2023-07-17T17:15:45.876000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:28:26.600560Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:28:26.600560Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:28:26.600560Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"ssvc_changed","at":"2026-06-29T01:31:23.274887Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T01:31:23.274887Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T01:31:23.274887Z","label":"SSVC decision revised","source":"vulnrichment"}]}