{"cve_id":"CVE-2023-33009","published":"2023-05-24T13:15:09.560000+00:00","last_modified":"2026-06-17T06:00:16.810000+00:00","vuln_status":"Analyzed","description":"A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN firmware versions 4.60 through 5.36 Patch 1, VPN series firmware versions 4.60 through 5.36 Patch 1, ZyWALL/USG series firmware versions 4.60 through 4.73 Patch 1, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and even a remote code execution on an affected device.","cvss_version":"3.1","cvss_vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","base_score":9.8,"base_severity":"CRITICAL","attack_vector":"NETWORK","privileges_req":"NONE","user_interaction":"NONE","scope":"UNCHANGED","impact_c":"HIGH","impact_i":"HIGH","impact_a":"HIGH","cwe_ids":["CWE-120"],"in_kev":true,"kev_date_added":"2023-06-05","kev_ransomware":false,"epss_score":0.28144,"epss_percentile":0.98111,"cap_rule_version":"0.1.1","stage":"INITIAL_ACCESS","req_access":"NONE","req_vector":"NETWORK","req_user_interaction":false,"grant_access":"USER","caps":["CODE_EXEC"],"terminal":false,"cap_confidence":"high","ingested_at":"2026-09-18T10:26:17.880410+00:00","first_seen":"2023-05-24T13:15:09.560000+00:00","kev_first_seen":"2023-06-05T00:00:00+00:00","novelty_score":0.0,"novelty_reasons":[],"novelty_at":null,"vendors":["zyxel"],"products":["atp100","atp100_firmware","atp100w","atp100w_firmware","atp200","atp200_firmware","atp500","atp500_firmware","atp700","atp700_firmware","atp800","atp800_firmware","usg20-vpn","usg20-vpn_firmware","usg_20w-vpn","usg_20w-vpn_firmware","usg_40","usg_40_firmware","usg_40w","usg_40w_firmware","usg_60","usg_60_firmware","usg_60w","usg_60w_firmware","usg_flex_100","usg_flex_100_firmware","usg_flex_100w","usg_flex_100w_firmware","usg_flex_200","usg_flex_200_firmware","usg_flex_50","usg_flex_500","usg_flex_500_firmware","usg_flex_50_firmware","usg_flex_50w","usg_flex_50w_firmware","usg_flex_700","usg_flex_700_firmware","vpn100","vpn1000","vpn1000_firmware","vpn100_firmware","vpn300","vpn300_firmware","vpn50","vpn50_firmware"],"affected":[{"vendor":"zyxel","product":"atp100_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"atp100w_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"atp200_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"atp500_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"atp700_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"atp800_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"usg20-vpn_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"usg_20w-vpn_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"usg_40_firmware","ranges":["≥ 4.60 and < 4.73","4.73"]},{"vendor":"zyxel","product":"usg_40w_firmware","ranges":["≥ 4.60 and < 4.73","4.73"]},{"vendor":"zyxel","product":"usg_60_firmware","ranges":["4.73","≥ 4.60 and < 4.73"]},{"vendor":"zyxel","product":"usg_60w_firmware","ranges":["≥ 4.60 and < 4.73","4.73"]},{"vendor":"zyxel","product":"usg_flex_100_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"usg_flex_100w_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"usg_flex_200_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"usg_flex_500_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"usg_flex_50_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"usg_flex_50w_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"usg_flex_700_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"vpn1000_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"vpn100_firmware","ranges":["≥ 4.60 and < 5.36","5.36"]},{"vendor":"zyxel","product":"vpn300_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]},{"vendor":"zyxel","product":"vpn50_firmware","ranges":["5.36","≥ 4.60 and < 5.36"]}]}