{"id":"CVE-2023-34140","state":"PUBLISHED","title":"A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2,  USG FLEX 50(W) se","description":"A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2,  USG FLEX 50(W) series firmware versions 4.16 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 4.16 through 5.36 Patch 2, VPN series firmware versions 4.30 through 5.36 Patch 2, NXC2500 firmware versions 6.10(AAIG.0) through 6.10(AAIG.3), and NXC5500 firmware versions 6.10(AAOS.0) through 6.10(AAOS.4), could allow an unauthenticated, LAN-based attacker to cause denial of service (DoS) conditions by sending a crafted request to the CAPWAP daemon.","publishedAt":"2023-07-17T17:49:38.175Z","updatedAt":"2024-10-21T19:42:15.688Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"Zyxel"},"assigner":"Zyxel","products":["Zyxel ATP series firmware","Zyxel USG FLEX series firmware","Zyxel USG FLEX 50(W) series firmware","Zyxel USG20(W)-VPN series firmware","Zyxel VPN series firmware","Zyxel NXC2500 firmware","Zyxel NXC5500 firmware"],"affected":[{"vendor":"Zyxel","product":"ATP series firmware","defaultStatus":"unaffected","versions":[{"version":"4.32 through 5.36 Patch 2","status":"affected"}]},{"vendor":"Zyxel","product":"USG FLEX series firmware","defaultStatus":"unaffected","versions":[{"version":"4.50 through 5.36 Patch 2","status":"affected"}]},{"vendor":"Zyxel","product":"USG FLEX 50(W) series firmware","defaultStatus":"unaffected","versions":[{"version":"4.16 through 5.36 Patch 2","status":"affected"}]},{"vendor":"Zyxel","product":"USG20(W)-VPN series firmware","defaultStatus":"unaffected","versions":[{"version":"4.16 through 5.36 Patch 2","status":"affected"}]},{"vendor":"Zyxel","product":"VPN series firmware","defaultStatus":"unaffected","versions":[{"version":"4.30 through 5.36 Patch 2","status":"affected"}]},{"vendor":"Zyxel","product":"NXC2500 firmware","defaultStatus":"unaffected","versions":[{"version":"6.10(AAIG.0) through 6.10(AAIG.3)","status":"affected"}]},{"vendor":"Zyxel","product":"NXC5500 firmware","defaultStatus":"unaffected","versions":[{"version":"6.10(AAOS.0) through 6.10(AAOS.4)","status":"affected"}]}],"references":["https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllers"],"weaknesses":["CWE-120"],"ingestedAt":"2026-10-29T20:06:00.499Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2023/34xxx/CVE-2023-34140.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.1","cveMetadata":{"cveId":"CVE-2023-34140","state":"PUBLISHED","datePublished":"2023-07-17T17:49:38.175Z","dateUpdated":"2024-10-21T19:42:15.688Z","assignerShortName":"Zyxel","assignerOrgId":"96e50032-ad0d-4058-a115-4d2c13821f9f","dateReserved":"2023-05-26T03:44:51.339Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2,  USG FLEX 50(W) series firmware versions 4.16 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