CVE-2023-34140

CVSS 3.1 Score 6.5 of 10 (medium)

Details

Published Jul 17, 2023
Updated: Jul 26, 2023
CWE ID 120

Summary

CVE-2023-34140 is a buffer overflow vulnerability impacting various Zyxel firmware versions, including those for ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, NXC2500, and NXC5500 series devices. This issue allows unauthenticated, LAN attackers to induce denial of service (DoS) conditions by exploiting a flaw in the CAPWAP daemon via specially crafted requests. The vulnerability affects Zyxel firmware versions 4.32 through 5.36 Patch 2 for ATP series, 4.50 through 5.36 Patch 2 for USG FLEX series, 4.16 through 5.36 Patch 2 for USG FLEX 50(W) series, 4.16 through 5.36 Patch 2 for USG20(W)-VPN series, 4.30 through 5.36 Patch 2 for VPN series, 6.10(AAIG.0) through 6.10(AAIG.3) for NXC2500, and 6.10(AAOS.0) through 6.10(AAOS.4) for NXC5500. Successful exploitation results in DoS conditions, posing a significant threat to network availability and requiring immediate remediation.

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Affected Products

  • Zyxel Usg Flex 200 Firmware
  • Zyxel Usg Flex 500 Firmware
  • Zyxel Usg Flex 100 Firmware
  • Zyxel Usg Flex 100w Firmware
  • Zyxel Usg Flex 700 Firmware

Affected Vendors

  • ZyXEL

Advisories, Assessments, and Mitigations

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