Zyxel Usg Flex Series Firmware
50 CVEs affecting Zyxel Usg Flex Series Firmware. Latest disclosed: 2026-02-05. Critical: 5, High: 26.
| CVE | Severity | Score | Published | Summary |
|---|---|---|---|---|
CVE-2023-33010 | Critical | 9.8 | 2023-05-24 | A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware version… |
CVE-2023-33009 | Critical | 9.8 | 2023-05-24 | A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions… |
CVE-2023-28771 | Critical | 9.8 | 2023-04-25 | Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series… |
CVE-2022-0342 | Critical | 9.8 | 2022-03-28 | An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.5… |
CVE-2021-35029 | Critical | 9.8 | 2021-07-02 | An authentication bypasss vulnerability in the web-based management interface of Zyxel USG/Zywall series firmware versions 4.35 through 4.64 and USG Flex, ATP… |
CVE-2023-34139 | High | 8.8 | 2023-07-17 | A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series… |
CVE-2023-33012 | High | 8.8 | 2023-07-17 | A command injection vulnerability in the configuration parser of the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware ver… |
CVE-2023-33011 | High | 8.8 | 2023-07-17 | A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2… |
CVE-2023-28767 | High | 8.8 | 2023-07-17 | 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… |
CVE-2023-27991 | High | 8.8 | 2023-04-24 | The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware ve… |
CVE-2025-9133 | High | 8.1 | 2025-10-21 | A missing authorization vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX series firmware versions from V4.50 through V5.4… |
CVE-2024-42057 | High | 8.1 | 2024-09-03 | A command injection vulnerability in the IPSec VPN feature of Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions fr… |
CVE-2023-6764 | High | 8.1 | 2024-02-20 | 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… |
CVE-2023-22916 | High | 8.1 | 2023-04-24 | The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware… |
CVE-2023-22913 | High | 8.1 | 2023-04-24 | A post-authentication command injection vulnerability in the “account_operator.cgi” CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, a… |
CVE-2023-34141 | High | 8.0 | 2023-07-17 | A command injection vulnerability in the access point (AP) management feature of the Zyxel ATP series firmware versions 5.00 through 5.36 Patch 2, USG FLEX ser… |
CVE-2023-34138 | High | 8.0 | 2023-07-17 | A command injection vulnerability in the hotspot management feature of the Zyxel ATP series firmware versions 4.60 through 5.36 Patch 2, USG FLEX series firmwa… |
CVE-2022-26532 | High | 7.8 | 2022-05-24 | A argument injection vulnerability in the 'packet-trace' CLI command of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware v… |
CVE-2024-11667 | High | 7.5 | 2024-11-27 | A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through V5.38, USG FLEX series firmware version… |
CVE-2024-42058 | High | 7.5 | 2024-09-03 | A null pointer dereference vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V… |