{"history":[{"alert":0,"cve":"CVE-2023-33009","id":22552,"kind":"epss","observed_at":1794500401,"payload":"{\"date\": \"2026-11-12\", \"epss\": 0.28144, \"percentile\": 0.98138}"},{"alert":0,"cve":"CVE-2023-33009","id":20171,"kind":"epss","observed_at":1794327601,"payload":"{\"date\": \"2026-11-10\", \"epss\": 0.28144, \"percentile\": 0.98126}"},{"alert":0,"cve":"CVE-2023-33009","id":18137,"kind":"epss","observed_at":1794241201,"payload":"{\"date\": \"2026-11-09\", \"epss\": 0.28144, \"percentile\": 0.98124}"},{"alert":0,"cve":"CVE-2023-33009","id":16201,"kind":"epss","observed_at":1794154800,"payload":"{\"date\": \"2026-11-08\", \"epss\": 0.28144, \"percentile\": 0.98123}"},{"alert":0,"cve":"CVE-2023-33009","id":14179,"kind":"epss","observed_at":1794068402,"payload":"{\"date\": \"2026-11-07\", \"epss\": 0.28144, \"percentile\": 0.98122}"},{"alert":0,"cve":"CVE-2023-33009","id":11961,"kind":"epss","observed_at":1793982001,"payload":"{\"date\": \"2026-11-06\", \"epss\": 0.28144, \"percentile\": 0.9812}"},{"alert":0,"cve":"CVE-2023-33009","id":9947,"kind":"epss","observed_at":1793938800,"payload":"{\"date\": \"2026-11-05\", \"epss\": 0.28144, \"percentile\": 0.98118}"},{"alert":0,"cve":"CVE-2023-33009","id":7495,"kind":"epss","observed_at":1793809200,"payload":"{\"date\": \"2026-11-04\", \"epss\": 0.28144, \"percentile\": 0.98118}"},{"alert":1,"cve":"CVE-2023-33009","id":6272,"kind":"cna","observed_at":1793809200,"payload":"{\"containers\": {\"adp\": [{\"providerMetadata\": {\"dateUpdated\": \"2024-08-02T15:32:46.565Z\", \"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\"}, \"references\": [{\"tags\": [\"x_transferred\"], \"url\": \"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls\"}], \"title\": \"CVE Program Container\"}, {\"metrics\": [{\"other\": {\"content\": {\"id\": \"CVE-2023-33009\", \"options\": [{\"Exploitation\": \"active\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"role\": \"CISA Coordinator\", \"timestamp\": \"2025-02-04T16:14:56.233928Z\", \"version\": \"2.0.3\"}, \"type\": \"ssvc\"}}, {\"other\": {\"content\": {\"dateAdded\": \"2023-06-05\", \"reference\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-33009\"}, \"type\": \"kev\"}}], \"providerMetadata\": {\"dateUpdated\": \"2025-10-21T23:05:47.636Z\", \"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\"}, \"references\": [{\"tags\": [\"government-resource\"], \"url\": \"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-33009\"}], \"timeline\": [{\"lang\": \"en\", \"time\": \"2023-06-05T00:00:00.000Z\", \"value\": \"CVE-2023-33009 added to CISA KEV\"}], \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"affected\": [{\"defaultStatus\": \"unaffected\", \"product\": \"ATP series firmware\", \"vendor\": \"Zyxel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.60 through 5.36 Patch 1\"}]}, {\"defaultStatus\": \"unaffected\", \"product\": \"USG FLEX series firmware\", \"vendor\": \"Zyxel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.60 through 5.36 Patch 1\"}]}, {\"defaultStatus\": \"unaffected\", \"product\": \"USG FLEX 50(W) firmware\", \"vendor\": \"Zyxel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.60 through 5.36 Patch 1\"}]}, {\"defaultStatus\": \"unaffected\", \"product\": \"USG20(W)-VPN firmware\", \"vendor\": \"Zyxel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.60 through 5.36 Patch 1\"}]}, {\"defaultStatus\": \"unaffected\", \"product\": \"VPN series firmware\", \"vendor\": \"Zyxel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.60 through 5.36 Patch 1\"}]}, {\"defaultStatus\": \"unaffected\", \"product\": \"ZyWALL/USG series firmware\", \"vendor\": \"Zyxel\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.60 through 4.73 Patch 1\"}]}], \"descriptions\": [{\"lang\": \"en\", \"supportingMedia\": [{\"base64\": false, \"type\": \"text/html\", \"value\": \"<p>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.</p>\"}], \"value\": \"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.\"}], \"metrics\": [{\"cvssV3_1\": {\"attackComplexity\": \"LOW\", \"attackVector\": \"NETWORK\", \"availabilityImpact\": \"HIGH\", \"baseScore\": 9.8, \"baseSeverity\": \"CRITICAL\", \"confidentialityImpact\": \"HIGH\", \"integrityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"scope\": \"UNCHANGED\", \"userInteraction\": \"NONE\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\", \"version\": \"3.1\"}, \"format\": \"CVSS\", \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"problemTypes\": [{\"descriptions\": [{\"cweId\": \"CWE-120\", \"description\": \"CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')\", \"lang\": \"en\", \"type\": \"CWE\"}]}], \"providerMetadata\": {\"dateUpdated\": \"2023-06-15T06:17:00.675Z\", \"orgId\": \"96e50032-ad0d-4058-a115-4d2c13821f9f\", \"shortName\": \"Zyxel\"}, \"references\": [{\"url\": \"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls\"}], \"source\": {\"discovery\": \"UNKNOWN\"}, \"x_generator\": {\"engine\": \"Vulnogram 0.1.0-dev\"}}}, \"cveMetadata\": {\"assignerOrgId\": \"96e50032-ad0d-4058-a115-4d2c13821f9f\", \"assignerShortName\": \"Zyxel\", \"cveId\": \"CVE-2023-33009\", \"datePublished\": \"2023-05-24T00:00:00.000Z\", \"dateReserved\": \"2023-05-17T00:00:00.000Z\", \"dateUpdated\": \"2025-10-21T23:05:47.636Z\", \"state\": \"PUBLISHED\"}, \"dataType\": \"CVE_RECORD\", \"dataVersion\": \"5.1\"}"},{"alert":0,"cve":"CVE-2023-33009","id":5272,"kind":"epss","observed_at":1793722800,"payload":"{\"date\": \"2026-11-03\", \"epss\": 0.28144, \"percentile\": 0.98114}"},{"alert":0,"cve":"CVE-2023-33009","id":3054,"kind":"epss","observed_at":1793665375,"payload":"{\"date\": \"2026-11-02\", \"epss\": 0.28144, \"percentile\": 0.98111}"},{"alert":1,"cve":"CVE-2023-33009","id":825,"kind":"kev","observed_at":1793665375,"payload":"{\"cveID\": \"CVE-2023-33009\", \"cwes\": [\"CWE-120\"], \"dateAdded\": \"2023-06-05\", \"dueDate\": \"2023-06-26\", \"forensicTriage\": \"No\", \"knownRansomwareCampaignUse\": \"Unknown\", \"notes\": \"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls;  https://nvd.nist.gov/vuln/detail/CVE-2023-33009\", \"product\": \"Multiple Firewalls\", \"requiredAction\": \"Apply updates per vendor instructions.\", \"shortDescription\": \"Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.\", \"vendorProject\": \"Zyxel\", \"vulnerabilityName\": \"Zyxel Multiple Firewalls Buffer Overflow Vulnerability\"}"}],"record":{"affected":[{"defaultStatus":"unaffected","product":"ATP series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"USG FLEX series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"USG FLEX 50(W) firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"USG20(W)-VPN firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"VPN series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"ZyWALL/USG series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 4.73 Patch 1"}]}],"cna":{"containers":{"adp":[{"providerMetadata":{"dateUpdated":"2024-08-02T15:32:46.565Z","orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE"},"references":[{"tags":["x_transferred"],"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls"}],"title":"CVE Program Container"},{"metrics":[{"other":{"content":{"id":"CVE-2023-33009","options":[{"Exploitation":"active"},{"Automatable":"yes"},{"Technical Impact":"total"}],"role":"CISA Coordinator","timestamp":"2025-02-04T16:14:56.233928Z","version":"2.0.3"},"type":"ssvc"}},{"other":{"content":{"dateAdded":"2023-06-05","reference":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-33009"},"type":"kev"}}],"providerMetadata":{"dateUpdated":"2025-10-21T23:05:47.636Z","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP"},"references":[{"tags":["government-resource"],"url":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-33009"}],"timeline":[{"lang":"en","time":"2023-06-05T00:00:00.000Z","value":"CVE-2023-33009 added to CISA KEV"}],"title":"CISA ADP Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"ATP series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"USG FLEX series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"USG FLEX 50(W) firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"USG20(W)-VPN firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"VPN series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 5.36 Patch 1"}]},{"defaultStatus":"unaffected","product":"ZyWALL/USG series firmware","vendor":"Zyxel","versions":[{"status":"affected","version":"4.60 through 4.73 Patch 1"}]}],"descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>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.</p>"}],"value":"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."}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-120","description":"CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2023-06-15T06:17:00.675Z","orgId":"96e50032-ad0d-4058-a115-4d2c13821f9f","shortName":"Zyxel"},"references":[{"url":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 0.1.0-dev"}}},"cveMetadata":{"assignerOrgId":"96e50032-ad0d-4058-a115-4d2c13821f9f","assignerShortName":"Zyxel","cveId":"CVE-2023-33009","datePublished":"2023-05-24T00:00:00.000Z","dateReserved":"2023-05-17T00:00:00.000Z","dateUpdated":"2025-10-21T23:05:47.636Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.1"},"cna_checked":1794262800,"cve":"CVE-2023-33009","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.","epss":{"date":"2026-11-12","epss":0.28144,"percentile":0.98138},"epss_checked":1794522003,"first_seen":1793665375,"kev":{"cveID":"CVE-2023-33009","cwes":["CWE-120"],"dateAdded":"2023-06-05","dueDate":"2023-06-26","forensicTriage":"No","knownRansomwareCampaignUse":"Unknown","notes":"https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls;  https://nvd.nist.gov/vuln/detail/CVE-2023-33009","product":"Multiple Firewalls","requiredAction":"Apply updates per vendor instructions.","shortDescription":"Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.","vendorProject":"Zyxel","vulnerabilityName":"Zyxel Multiple Firewalls Buffer Overflow Vulnerability"},"kev_checked":1794522003,"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, Zyxel ZyWALL/USG series firmware","references":["https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-buffer-overflow-vulnerabilities-of-firewalls","https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-33009"],"score":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":9.8,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","provider":"Zyxel","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"solutions":"","state":"PUBLISHED","title":"Zyxel Multiple Firewalls Buffer Overflow Vulnerability","updated_at":1794500401,"workarounds":""},"sources":[]}
