High severity8.8NVD Advisory· Published Jul 17, 2023· Updated Jun 17, 2026

CVE-2023-28767

Description

The configuration parser fails to sanitize user-controlled input in the Zyxel ATP series firmware versions 5.10 through 5.36, USG FLEX series firmware versions 5.00 through 5.36, USG FLEX 50(W) series firmware versions 5.10 through 5.36,

USG20(W)-VPN series firmware versions 5.10 through 5.36, and VPN series firmware versions 5.00 through 5.36. An unauthenticated, LAN-based attacker could leverage the vulnerability to inject some operating system (OS) commands into the device configuration data on an affected device when the cloud management mode is enabled.

AI Insight

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

Affected products

Zyxel/Usg20w VPN Firmware
cpe:2.3:o:zyxel:usg_20w-vpn_firmware:*:*:*:*:*:*:*:*
Range: >=5.10,<5.37
Zyxel/Usg2200 VPN Firmware
cpe:2.3:o:zyxel:usg_2200-vpn_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Usg Flex 100 Firmware
cpe:2.3:o:zyxel:usg_flex_100_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Usg Flex 100w Firmware
cpe:2.3:o:zyxel:usg_flex_100w_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Usg Flex 200 Firmware
cpe:2.3:o:zyxel:usg_flex_200_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Usg Flex 500 Firmware
cpe:2.3:o:zyxel:usg_flex_500_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Usg Flex 50 Firmware
cpe:2.3:o:zyxel:usg_flex_50_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Usg Flex 50w Firmware
cpe:2.3:o:zyxel:usg_flex_50w_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Usg Flex 700 Firmware
cpe:2.3:o:zyxel:usg_flex_700_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Zywall Atp100 Firmware
cpe:2.3:o:zyxel:zywall_atp100_firmware:*:*:*:*:*:*:*:*
Range: >=5.10,<5.37
Zyxel/Zywall Atp100w Firmware
cpe:2.3:o:zyxel:zywall_atp100w_firmware:*:*:*:*:*:*:*:*
Range: >=5.10,<5.37
Zyxel/Zywall Atp200 Firmware
cpe:2.3:o:zyxel:zywall_atp200_firmware:*:*:*:*:*:*:*:*
Range: >=5.10,<5.37
Zyxel/Zywall Atp500 Firmware
cpe:2.3:o:zyxel:zywall_atp500_firmware:*:*:*:*:*:*:*:*
Range: >=5.10,<5.37
Zyxel/Zywall Atp700 Firmware
cpe:2.3:o:zyxel:zywall_atp700_firmware:*:*:*:*:*:*:*:*
Range: >=5.10,<5.37
Zyxel/Zywall Atp800 Firmware
cpe:2.3:o:zyxel:zywall_atp800_firmware:*:*:*:*:*:*:*:*
Range: >=5.10,<5.37
Zyxel/Zywall Vpn100 Firmware2 versions
cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:zywall_vpn100_firmware:*:*:*:*:*:*:*:*range: >=5.00,<5.37
- cpe:2.3:o:zyxel:zywall_vpn_100_firmware:*:*:*:*:*:*:*:*range: >=5.00,<5.37
Zyxel/Zywall Vpn2s Firmware
cpe:2.3:o:zyxel:zywall_vpn2s_firmware:*:*:*:*:*:*:*:*
Range: >=5.00,<5.37
Zyxel/Zywall Vpn300 Firmware2 versions
cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:zywall_vpn300_firmware:*:*:*:*:*:*:*:*range: >=5.00,<5.37
- cpe:2.3:o:zyxel:zywall_vpn_300_firmware:*:*:*:*:*:*:*:*range: >=5.00,<5.37
Zyxel/Zywall Vpn50 Firmware2 versions
cpe:2.3:o:zyxel:zywall_vpn50_firmware:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:zyxel:zywall_vpn50_firmware:*:*:*:*:*:*:*:*range: >=5.00,<5.37
- cpe:2.3:o:zyxel:zywall_vpn_50_firmware:*:*:*:*:*:*:*:*range: >=5.00,<5.37
Zyxel/ATP series firmwarellm-fuzzy
Range: 5.10 - 5.36
Zyxel/USG FLEX series firmwarellm-fuzzy
Range: 5.00 - 5.36
Zyxel/USG20(W)-VPN series firmwarellm-fuzzy
Range: 5.10 - 5.36
Zyxel/VPN series firmwarellm-fuzzy
Range: 5.00 - 5.36
Zyxel/ATP seriescpe-rescue
Range: 5.10 through 5.36
Zyxel/USG FLEX seriescpe-rescue2 versions
5.10 through 5.36+ 1 more
- (no CPE)range: 5.10 through 5.36
- (no CPE)range: 5.00 through 5.36
Zyxel/USG20(W)-VPN seriescpe-rescue
Range: 5.10 through 5.36
Zyxel/VPN seriescpe-rescue
Range: 5.00 through 5.36

Patches

Vulnerability mechanics

References

www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-wlan-controllersnvdVendor Advisory

News mentions

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