CVSS 3.1 Score 6.5 of 10 (medium)


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


CVE-2023-34140 is a buffer overflow vulnerability found 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). This vulnerability could allow an unauthenticated attacker on the local network to cause denial of service (DoS) conditions by sending a crafted request to the CAPWAP daemon. To remediate this vulnerability, organizations should update their affected products to a patched version of the firmware provided by Zyxel. The potential danger posed by this vulnerability is the disruption of network services and potential exploitation by attackers on the local network, leading to further security breaches or unauthorized access to sensitive information within an organization's network infrastructure.

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