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    CVE-2023-28771

    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 firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.

    Published:Apr 25, 2023
    Last Modified:Oct 27, 2025
    EPS:Apr 25, 2023
    EPSS Score:0.94354
    CVSS Score:9.8

    CISA Notification

    Description

    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 firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.

    Required Action:

    Apply updates per vendor instructions.

    Notes:

    No extra notes provided.

    Due Date
    Jun 21, 2023
    1178 days ago
    Alert Date
    May 31, 2023
    1199 days ago

    Affected Products

    Vendor
    Zyxel
    Product
    Atp100
    Vendor
    Zyxel
    Product
    Atp100 Firmware
    Vendor
    Zyxel
    Product
    Atp100w
    Vendor
    Zyxel
    Product
    Atp100w Firmware
    Vendor
    Zyxel
    Product
    Atp200
    Vendor
    Zyxel
    Product
    Atp200 Firmware
    Vendor
    Zyxel
    Product
    Atp500
    Vendor
    Zyxel
    Product
    Atp500 Firmware
    Vendor
    Zyxel
    Product
    Atp700
    Vendor
    Zyxel
    Product
    Atp700 Firmware
    Vendor
    Zyxel
    Product
    Atp800
    Vendor
    Zyxel
    Product
    Atp800 Firmware
    Vendor
    Zyxel
    Product
    Usg Flex 100
    Vendor
    Zyxel
    Product
    Usg Flex 100 Firmware
    Vendor
    Zyxel
    Product
    Usg Flex 100w
    Vendor
    Zyxel
    Product
    Usg Flex 100w Firmware
    Vendor
    Zyxel
    Product
    Usg Flex 200
    Vendor
    Zyxel
    Product
    Usg Flex 200 Firmware
    Vendor
    Zyxel
    Product
    Usg Flex 50
    Vendor
    Zyxel
    Product
    Usg Flex 500
    Vendor
    Zyxel
    Product
    Usg Flex 500 Firmware
    Vendor
    Zyxel
    Product
    Usg Flex 50 Firmware
    Vendor
    Zyxel
    Product
    Usg Flex 50w
    Vendor
    Zyxel
    Product
    Usg Flex 50w Firmware
    Vendor
    Zyxel
    Product
    Usg Flex 700
    Vendor
    Zyxel
    Product
    Usg Flex 700 Firmware
    Vendor
    Zyxel
    Product
    Vpn100
    Vendor
    Zyxel
    Product
    Vpn1000
    Vendor
    Zyxel
    Product
    Vpn1000 Firmware
    Vendor
    Zyxel
    Product
    Vpn100 Firmware
    Vendor
    Zyxel
    Product
    Vpn300
    Vendor
    Zyxel
    Product
    Vpn300 Firmware
    Vendor
    Zyxel
    Product
    Vpn50
    Vendor
    Zyxel
    Product
    Vpn50 Firmware
    Vendor
    Zyxel
    Product
    Zywall Usg 100
    Vendor
    Zyxel
    Product
    Zywall Usg 100 Firmware
    Vendor
    Zyxel
    Product
    Zywall Usg 310
    Vendor
    Zyxel
    Product
    Zywall Usg 310 Firmware

    Exploits

    http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.htmlhttp://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.htmlhttps://github.com/benjaminhays/CVE-2023-28771-PoChttps://github.com/JinParkmida/cve-2023-28771-demo

    Related CVEs

    CVE-2025-9133 (CVSS 8.1) — A missing authorization vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX…
    CVE-2025-8078 (CVSS 7.2) — A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.32 through…
    CVE-2024-11667 (CVSS 7.5) — A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.0…
    CVE-2024-42061 (CVSS 6.1) — A reflected cross-site scripting (XSS) vulnerability in the CGI program "dynamic_script.cgi" of Zyxel ATP seri…
    CVE-2024-42060 (CVSS 7.2) — A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.32 through…
    CVE-2024-42059 (CVSS 7.2) — A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V5.00 through…
    CVE-2024-42058 (CVSS 7.5) — A null pointer dereference vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.38, USG F…
    CVE-2024-42057 (CVSS 8.1) — A command injection vulnerability in the IPSec VPN feature of Zyxel ATP series firmware versions from V4.32 th…
    CVE-2024-7203 (CVSS 7.2) — A post-authentication command injection vulnerability in Zyxel ATP series firmware versions from V4.60 through…
    CVE-2024-6343 (CVSS 4.9) — A buffer overflow vulnerability in the CGI program of Zyxel ATP series firmware versions from V4.32 through V5…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High