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High severity8.1NVD Advisory· Published Feb 20, 2024· Updated Jun 17, 2026

CVE-2023-6764

CVE-2023-6764

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

70
  • Zyxel/Atp100 Firmware3 versions
    cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:atp100_firmware:*:*:*:*:*:*:*:*range: >=4.32,<5.37
    • cpe:2.3:o:zyxel:atp100_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:atp100_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Atp100w Firmware3 versions
    cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:atp100w_firmware:*:*:*:*:*:*:*:*range: >=4.32,<5.37
    • cpe:2.3:o:zyxel:atp100w_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:atp100w_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Atp200 Firmware3 versions
    cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:atp200_firmware:*:*:*:*:*:*:*:*range: >=4.32,<5.37
    • cpe:2.3:o:zyxel:atp200_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:atp200_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Atp500 Firmware3 versions
    cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:atp500_firmware:*:*:*:*:*:*:*:*range: >=4.32,<5.37
    • cpe:2.3:o:zyxel:atp500_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:atp500_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Atp700 Firmware3 versions
    cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:atp700_firmware:*:*:*:*:*:*:*:*range: >=4.32,<5.37
    • cpe:2.3:o:zyxel:atp700_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:atp700_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Atp800 Firmware3 versions
    cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:atp800_firmware:*:*:*:*:*:*:*:*range: >=4.32,<5.37
    • cpe:2.3:o:zyxel:atp800_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:atp800_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg20 VPN Firmware3 versions
    cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg20-vpn_firmware:*:*:*:*:*:*:*:*range: >=4.16,<5.37
    • cpe:2.3:o:zyxel:usg20-vpn_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg20-vpn_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg20w VPN Firmware3 versions
    cpe:2.3:o:zyxel:usg20w-vpn_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg20w-vpn_firmware:*:*:*:*:*:*:*:*range: >=4.16,<5.37
    • cpe:2.3:o:zyxel:usg20w-vpn_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg20w-vpn_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 100 Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_100_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_100_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 100ax Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_100ax_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_100ax_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_100ax_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_100ax_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 100h Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_100h_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_100h_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_100h_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_100h_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 100w Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_100w_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_100w_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 200 Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_200_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_200_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 200h Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_200h_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_200h_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_200h_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_200h_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 200hp Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_200hp_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_200hp_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_200hp_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_200hp_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 500 Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_500_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_500_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 500h Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_500h_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_500h_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_500h_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_500h_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 50 Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*range: >=4.16,<5.37
    • cpe:2.3:o:zyxel:usg_flex_50_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_50_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 50w Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*range: >=4.16,<5.37
    • cpe:2.3:o:zyxel:usg_flex_50w_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_50w_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 700 Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_700_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_700_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/Usg Flex 700h Firmware3 versions
    cpe:2.3:o:zyxel:usg_flex_700h_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:zyxel:usg_flex_700h_firmware:*:*:*:*:*:*:*:*range: >=4.50,<5.37
    • cpe:2.3:o:zyxel:usg_flex_700h_firmware:5.37:-:*:*:*:*:*:*
    • cpe:2.3:o:zyxel:usg_flex_700h_firmware:5.37:patch1:*:*:*:*:*:*
  • Zyxel/ATP series firmwarellm-fuzzy
    Range: 4.32 - 5.37 Patch 1
  • Zyxel/USG FLEX series firmwarellm-fuzzy
    Range: 4.50 - 5.37 Patch 1
  • Zyxel/USG20(W)-VPN series firmwarellm-fuzzy
    Range: 4.16 - 5.37 Patch 1
  • Zyxel/ATP seriescpe-rescue
    Range: version 4.32 through 5.37 Patch 1
  • Zyxel/USG FLEX seriescpe-rescue2 versions
    version 4.16 through 5.37 Patch 1+ 1 more
    • (no CPE)range: version 4.16 through 5.37 Patch 1
    • (no CPE)range: version 4.50 through 5.37 Patch 1
  • Zyxel/USG20(W)-VPN seriescpe-rescue
    Range: version 4.16 through 5.37 Patch 1

Patches

Vulnerability mechanics

References

1

News mentions

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