Product by Zyxel

    Usg Flex Series Firmware

    51 known vulnerabilities in Usg Flex Series Firmware (Zyxel), 4 of them actively exploited (CISA KEV).

    Key figures

    51

    Vulnerabilities

    4

    Actively exploited (KEV)

    1

    Used by ransomware

    6

    Critical

    Vulnerabilities

    Actively exploited vulnerabilities (CISA KEV) first, then by priority. Click a column header to re-sort the table.

    Vulnerabilities in Usg Flex Series Firmware (Zyxel)
    CriticalCVE-2023-28771

    Zyxel Multiple Firewalls OS Command Injection Vulnerability

    In CISA KEValso in 20 other products

    		9.8
    CriticalCVE-2024-11667

    Zyxel Multiple Firewalls Path Traversal Vulnerability

    In CISA KEVRansomwarealso in 4 other products

    		7.5
    CriticalCVE-2023-33010

    Zyxel Multiple Firewalls Buffer Overflow Vulnerability

    In CISA KEValso in 28 other products

    		9.8
    CriticalCVE-2023-33009

    Zyxel Multiple Firewalls Buffer Overflow Vulnerability

    In CISA KEValso in 28 other products

    		9.8
    CriticalCVE-2022-0342

    Zyxel USG/ZyWALL series firmware: Improper Authentication

    also in 27 other products

    		9.8
    HighCVE-2025-9133

    Zyxel ATP series firmware: Missing Authorization

    also in 4 other products

    		8.1
    HighCVE-2023-33012

    Zyxel ATP series firmware: OS Command Injection

    also in 26 other products

    		8.8
    HighCVE-2022-26532

    Zyxel USG/ZyWALL series firmware: Argument Injection

    also in 64 other products

    		7.8
    CriticalCVE-2021-35029

    Zyxel USG/Zywall series Firmware: Improper Authentication

    also in 35 other products

    		9.8
    MediumCVE-2022-0734

    Zyxel USG/ZyWALL series firmware: Cross-site Scripting

    also in 35 other products

    		5.8
    HighCVE-2022-26531

    Zyxel USG/ZyWALL series firmware: Improper Input Validation

    also in 64 other products

    		6.1
    HighCVE-2022-38547

    Zyxel ZyWALL/USG series firmware: OS Command Injection

    also in 28 other products

    		7.2
    HighCVE-2025-11730

    Zyxel ATP series firmware: OS Command Injection

    also in 3 other products

    		7.2
    HighCVE-2025-8078

    Zyxel ATP series firmware: OS Command Injection

    also in 4 other products

    		7.2
    HighCVE-2023-27991

    Zyxel ATP series firmware: OS Command Injection

    also in 23 other products

    		8.8
    HighCVE-2024-42057

    Zyxel ATP series firmware: OS Command Injection

    also in 4 other products

    		8.1
    HighCVE-2024-42060

    Zyxel ATP series firmware: OS Command Injection

    also in 4 other products

    		7.2
    HighCVE-2024-42059

    Zyxel ATP series firmware: OS Command Injection

    also in 4 other products

    		7.2
    HighCVE-2024-7203

    Zyxel ATP series firmware: OS Command Injection

    also in 2 other products

    		7.2
    HighCVE-2023-22913

    Zyxel USG FLEX series firmware: Command Injection

    also in 12 other products

    		8.1
    HighCVE-2023-6398

    Zyxel ATP series firmware: OS Command Injection

    also in 45 other products

    		7.2
    HighCVE-2026-14818

    Zyxel ATP series firmware: Path Traversal

    also in 3 other products

    		7.2
    HighCVE-2023-22915

    Zyxel USG FLEX series firmware: Classic Buffer Overflow

    also in 15 other products

    		7.5
    HighCVE-2023-6764

    Zyxel ATP series firmware: Use of Externally-Controlled Format String

    also in 24 other products

    		8.1
    HighCVE-2023-34139

    Zyxel USG FLEX series firmware: OS Command Injection

    also in 16 other products

    		8.8

    All vulnerabilities in search

    All products by Zyxel