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  • WAGO GmbH & Co. KG Industrial Managed Switches

    From CISA Advisories@2:263/1 to All on Thu Mar 26 16:11:07 2026
    WAGO GmbH & Co. KG Industrial Managed Switches

    View CSAF
    Summary
    An unauthenticated remote attacker can exploit a hidden function in the CLI prompt to escape the restricted interface, leading to full compromise of the device.
    The following versions of WAGO GmbH & Co. KG Industrial Managed Switches are affected:

    WAGO Firmware versions prior to V1.2.1.S0 WAGO_Hardware_852-1812 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.1.S0 WAGO_Hardware_852-1813 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.3.S0 WAGO_Hardware_852-1813/000-001 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.1.S0 WAGO_Hardware_852-1816 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.8.S0 WAGO_Hardware_852-303 (CVE-2026-3587) WAGO Firmware versions prior to V1.2.0.S0 WAGO_Hardware_852-1305 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.0.S0 WAGO_Hardware_852-1305/000-001 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.0.S0 WAGO_Hardware_852-1505/000-001 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.1.9.S0 WAGO_Hardware_852-1505 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.0.6.S0 WAGO_Hardware_852-602 (CVE-2026-3587) WAGO Firmware versions prior to V1.0.6.S0 WAGO_Hardware_852-603 (CVE-2026-3587) WAGO Firmware versions prior to V1.2.5.S0 WAGO_Hardware_852-1605 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.1.S0 WAGO_Hardware_852-1812/010-000 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.1.S0 WAGO_Hardware_852-1813/010-000 (CVE-2026-3587)
    WAGO Firmware versions prior to V1.2.1.S0 WAGO_Hardware_852-1816/010-000 (CVE-2026-3587)
    WAGO Firmware version V1.0.6.S0 WAGO_Hardware_852-602 (CVE-2026-3587)
    WAGO Firmware version V1.0.6.S0 WAGO_Hardware_852-603 (CVE-2026-3587)
    WAGO Firmware version V1.1.9.S0 WAGO_Hardware_852-1505 (CVE-2026-3587)
    WAGO Firmware version V1.2.0.S0 WAGO_Hardware_852-1305 (CVE-2026-3587)
    WAGO Firmware version V1.2.0.S0 WAGO_Hardware_852-1305/000-001 (CVE-2026-3587) WAGO Firmware version V1.2.0.S0 WAGO_Hardware_852-1505/000-001 (CVE-2026-3587) WAGO Firmware version V1.2.1.S0 WAGO_Hardware_852-1812 (CVE-2026-3587)
    WAGO Firmware version V1.2.1.S0 WAGO_Hardware_852-1813 (CVE-2026-3587)
    WAGO Firmware version V1.2.1.S0 WAGO_Hardware_852-1816 (CVE-2026-3587)
    WAGO Firmware version V1.2.1.S0 WAGO_Hardware_852-1812/010-000 (CVE-2026-3587) WAGO Firmware version V1.2.1.S0 WAGO_Hardware_852-1813/010-000 (CVE-2026-3587) WAGO Firmware version V1.2.1.S0 WAGO_Hardware_852-1816/010-000 (CVE-2026-3587) WAGO Firmware version V1.2.3.S0 WAGO_Hardware_852-1813/000-001 (CVE-2026-3587) WAGO Firmware version V1.2.5.S0 WAGO_Hardware_852-1605 (CVE-2026-3587)
    WAGO Firmware version V1.2.8.S0 WAGO_Hardware_852-303 (CVE-2026-3587)
    WAGO Firmware version V1.2.1.S0 WAGO_Hardware_852-1813/010-001 (CVE-2026-3587) WAGO Firmware version V1.2.1.S1 WAGO_Hardware_852-1813/010-001 (CVE-2026-3587)





    CVSS
    Vendor
    Equipment
    Vulnerabilities




    v3 10
    WAGO
    WAGO GmbH & Co. KG Industrial Managed Switches
    Hidden Functionality




    Background

    Critical Infrastructure Sectors: Commercial Facilities, Critical Manufacturing, Energy, Transportation Systems
    Countries/Areas Deployed: Worldwide
    Company Headquarters Location: Germany


    Vulnerabilities

    Expand All +

    CVE-2026-3587

    An unauthenticated remote attacker can exploit a hidden function in the CLI prompt to escape the restricted interface, leading to full compromise of the device.
    View CVE Details

    Affected Products
    WAGO GmbH & Co. KG Industrial Managed Switches

    Vendor:WAGO
    Product Version:WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGO_Hardware_852-1812, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGO_Hardware_852-1813, WAGO WAGO Firmware versions prior to V1.2.3.S0: WAGO_Hardware_852-1813/000-001, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGO_Hardware_852-1816, WAGO WAGO Firmware versions prior to V1.2.8.S0: WAGO_Hardware_852-303, WAGO WAGO Firmware versions prior to V1.2.0.S0: WAGO_Hardware_852-1305, WAGO WAGO Firmware versions prior to V1.2.0.S0: WAGO_Hardware_852-1305/000-001, WAGO WAGO Firmware versions prior to V1.2.0.S0: WAGO_Hardware_852-1505/000-001, WAGO WAGO Firmware versions prior to V1.1.9.S0: WAGO_Hardware_852-1505, WAGO WAGO Firmware versions prior to V1.0.6.S0: WAGO_Hardware_852-602, WAGO WAGO Firmware versions prior to V1.0.6.S0: WAGO_Hardware_852-603, WAGO WAGO Firmware versions prior to V1.2.5.S0: WAGO_Hardware_852-1605, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGO_Hardware_852-1812/010-000, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGO_Hardware_852-1813/010-000, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGO_Hardware_852-1816/010-000, WAGO WAGO Firmware version V1.0.6.S0: WAGO_Hardware_852-602, WAGO WAGO Firmware version V1.0.6.S0: WAGO_Hardware_852-603, WAGO WAGO Firmware version V1.1.9.S0: WAGO_Hardware_852-1505, WAGO WAGO Firmware version V1.2.0.S0: WAGO_Hardware_852-1305, WAGO WAGO Firmware version V1.2.0.S0: WAGO_Hardware_852-1305/000-001, WAGO WAGO Firmware version V1.2.0.S0: WAGO_Hardware_852-1505/000-001, WAGO WAGO Firmware version V1.2.1.S0: WAGO_Hardware_852-1812, WAGO WAGO Firmware version V1.2.1.S0: WAGO_Hardware_852-1813, WAGO WAGO Firmware version V1.2.1.S0: WAGO_Hardware_852-1816, WAGO WAGO Firmware version V1.2.1.S0: WAGO_Hardware_852-1812/010-000, WAGO WAGO Firmware version V1.2.1.S0: WAGO_Hardware_852-1813/010-000, WAGO WAGO Firmware version V1.2.1.S0: WAGO_Hardware_852-1816/010-000, WAGO WAGO Firmware version V1.2.3.S0: WAGO_Hardware_852-1813/000-001, WAGO WAGO Firmware version V1.2.5.S0: WAGO_Hardware_852-1605, WAGO WAGO Firmware version V1.2.8.S0: WAGO_Hardware_852-303, WAGO WAGO Firmware version V1.2.1.S0: WAGO_Hardware_852-1813/010-001, WAGO WAGO Firmware version V1.2.1.S1: WAGO_Hardware_852-1813/010-001
    Product Status:known_affected


    Remediations
    MitigationWAGO has identified the following specific workarounds and mitigations users can apply to reduce risk: Product Group: WAGO Firmware installed on WAGO Hardware 852-1812, WAGO Firmware installed on WAGO Hardware 852-1813, WAGO Firmware installed on WAGO Hardware 852-1813/000-001, WAGO Firmware installed on WAGO Hardware 852-1816, WAGO Firmware installed on WAGO Hardware 852-303, WAGO Firmware installed on WAGO Hardware 852-1305, WAGO Firmware installed on WAGO Hardware 852-1305/000-001, WAGO Firmware installed on WAGO Hardware 852-1505/000-001, WAGO Firmware installed on WAGO Hardware 852-1505, WAGO Firmware installed on WAGO Hardware 852-602, WAGO Firmware installed on WAGO Hardware 852-603, WAGO Firmware installed on WAGO Hardware 852-1605, WAGO Firmware installed on WAGO Hardware 852-1812/010-000, WAGO Firmware installed on WAGO Hardware 852-1813/010-000, WAGO Firmware installed on WAGO Hardware 852-1816/010-000, WAGO Firmware installed on WAGO Hardware 852-602, WAGO Firmware installed on WAGO Hardware 852-603, WAGO Firmware installed on WAGO Hardware 852-1505, WAGO Firmware installed on WAGO Hardware 852-1305, WAGO Firmware installed on WAGO Hardware 852-1305/000-001, WAGO Firmware installed on WAGO Hardware 852-1505/000-001, WAGO Firmware installed on WAGO Hardware 852-1812, WAGO Firmware installed on WAGO Hardware 852-1813, WAGO Firmware installed on WAGO Hardware 852-1816, WAGO Firmware installed on WAGO Hardware 852-1812/010-000, WAGO Firmware installed on WAGO Hardware 852-1813/010-000, WAGO Firmware installed on WAGO Hardware 852-1816/010-000, WAGO Firmware installed on WAGO Hardware 852-1813/000-001, WAGO Firmware installed on WAGO Hardware 852-1605, WAGO Firmware installed on WAGO Hardware 852-303, WAGO Firmware installed on WAGO Hardware 852-1813/010-001, WAGO Firmware installed on WAGO Hardware 852-1813/010-001): Please update your devices to the specified fixed Firmware version.
    MitigationLean Managed Switch 852-1812, Lean Managed Switch 852-1813, Lean Managed Switch 852-1813/000-001, Lean Managed Switch 852-1816, Lean Managed Switch 852-1812/010-000, Lean Managed Switch 852-1813/010-000, Lean Managed Switch 852-1816/010-000, Lean Managed Switch 852-1813/010-001: To eliminate the attack vector deactivate ssh and telnet on the device.
    MitigationIndustrial Managed Switch 852-303, Industrial Managed Switch 852-1305, Industrial Managed Switch 852-1305/000-001, Industrial Managed Switch 852-1505/000-001, Industrial Managed Switch 852-1505, Industrial Managed Switch 852-602, Industrial Managed Switch 852-603, Industrial Managed Switch 852-1605: To reduce the attack vector deactivate ssh and telnet on the devices. This ensures that the CLI is only accessible locally via RS232.
    MitigationThe following product versions have been fixed: Firmware V1.2.1.S1 installed on Lean Managed Switch 852-1812 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.1.S1 installed on Lean Managed Switch 852-1813 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.3.S1 installed on Lean Managed Switch 852-1813/000-001 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.1.S1 installed on Lean Managed Switch 852-1816 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.8.S1 installed on Industrial Managed Switch 852-303 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.0.S1 installed on Industrial Managed Switch 852-1305 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.0.S1 installed on Industrial Managed Switch 852-1305/000-001 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.0.S1 installed on Industrial Managed Switch 852-1505/000-001 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.1.9.S1 installed on Industrial Managed Switch 852-1505 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.0.6.S1 installed on Industrial Managed Switch 852-602 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.0.6.S1 installed on Industrial Managed Switch 852-603 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.5.S1 installed on Industrial Managed Switch 852-1605 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.1.S1 installed on Lean Managed Switch 852-1812/010-000 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.1.S1 installed on Lean Managed Switch 852-1813/010-000 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.1.S1 installed on Lean Managed Switch 852-1816/010-000 are fixed versions for CVE-2026-3587
    MitigationFirmware V1.2.1.S1 installed on Lean Managed Switch 852-1813/010-001 are fixed versions for CVE-2026-3587
    MitigationFor more information see the associated WAGO GmbH & Co. KG security advisory VDE-2026-020 WAGO PSIRT: https://www.wago.com/de-en/automation-technology/psirt. VDE-2026-020: WAGO: Vulnerability in managed switches - HTML: https://certvde.com/en/advisories/VDE-2026-020. VDE-2026-020: WAGO: Vulnerability in managed switches - CSAF: https://wago.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2026-020.json.https://www.wago.com/de-en/automation-technology/psirt
    MitigationFor more information see the associated WAGO GmbH & Co. KG security advisory VDE-2026-020 WAGO PSIRT: https://www.wago.com/de-en/automation-technology/psirt. VDE-2026-020: WAGO: Vulnerability in managed switches - HTML: https://certvde.com/en/advisories/VDE-2026-020. VDE-2026-020: WAGO: Vulnerability in managed switches - CSAF: https://wago.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2026-020.json.https://certvde.com/en/advisories/VDE-2026-020
    MitigationFor more information see the associated WAGO GmbH & Co. KG security advisory VDE-2026-020 WAGO PSIRT: https://www.wago.com/de-en/automation-technology/psirt. VDE-2026-020: WAGO: Vulnerability in managed switches - HTML: https://certvde.com/en/advisories/VDE-2026-020. VDE-2026-020: WAGO: Vulnerability in managed switches - CSAF: https://wago.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2026-020.json.https://wago.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2026-020.json

    Relevant CWE: CWE-912 Hidden Functionality

    Metrics




    CVSS Version
    Base Score
    Base Severity
    Vector String




    3.1
    10
    CRITICAL
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H








    Acknowledgments

    CERT@VDE coordination reported this vulnerability to CISA


    Legal Notice and Terms of Use
    This product is provided subject to this Notification (https://www.cisa.gov/notification) and this Privacy & Use policy (https://www.cisa.gov/privacy-policy).

    Recommended Practices
    CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability.
    Minimize network exposure for all control system devices and/or systems, ensuring they are not accessible from the internet.
    Locate control system networks and remote devices behind firewalls and isolating them from business networks.
    When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs). Recognize VPNs may have vulnerabilities, should be updated to the most recent version available, and are only as secure as the connected devices.
    CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
    CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
    CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets.
    Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies.
    Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents.
    CISA also recommends users take the following measures to protect themselves from social engineering attacks:
    Do not click web links or open attachments in unsolicited email messages.
    Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams.
    Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks.
    No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time.

    Revision History

    Initial Release Date: 2026-03-26




    Date
    Revision
    Summary




    2026-03-26
    1
    Initial Republication of WAGO GmbH & Co. KG VDE-2026-020




    Legal Notice and Terms of Use

    https://www.cisa.gov/news-events/ics-advisories/icsa-26-085-01

    2026-03-26 12:00 UTC
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