CVE-2023-6764

A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, and USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1 could allow an attacker to achieve unauthorized remote code execution by sending a sequence of specially crafted payloads containing an invalid pointer; however, such an attack would require detailed knowledge of an affected device’s memory layout and configuration. It has a CVSS v3.1 base score of 8.1 (HIGH).

CVE-2023-6764 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

CVE-2023-6764 affects products from zyxel, specifically: atp100, atp100_firmware, atp100w, atp100w_firmware, atp200, atp200_firmware, atp500, atp500_firmware, atp700, atp700_firmware, atp800, atp800_firmware, usg20-vpn, usg20-vpn_firmware, usg20w-vpn, usg20w-vpn_firmware, usg_flex_100, usg_flex_100_firmware, usg_flex_100ax, usg_flex_100ax_firmware, usg_flex_100h, usg_flex_100h_firmware, usg_flex_100w, usg_flex_100w_firmware, usg_flex_200, usg_flex_200_firmware, usg_flex_200h, usg_flex_200h_firmware, usg_flex_200hp, usg_flex_200hp_firmware, usg_flex_50, usg_flex_500, usg_flex_500_firmware, usg_flex_500h, usg_flex_500h_firmware, usg_flex_50_firmware, usg_flex_50w, usg_flex_50w_firmware, usg_flex_700, usg_flex_700_firmware, usg_flex_700h, usg_flex_700h_firmware. Check the affected products table above for specific version ranges.

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.