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WAGO Industrial Managed Switches Vulnerability Disclosed

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Published March 26th, 2026
Detected March 26th, 2026
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Summary

CISA has disclosed a critical vulnerability (CVE-2026-3587) affecting multiple versions of WAGO Industrial Managed Switches. An unauthenticated remote attacker can exploit a hidden function in the CLI prompt to gain full compromise of the device. Affected sectors include Commercial Facilities, Critical Manufacturing, Energy, and Transportation Systems.

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What changed

CISA has issued an advisory (ICSA-26-085-01) detailing a critical vulnerability, CVE-2026-3587, affecting numerous firmware versions of WAGO GmbH & Co. KG Industrial Managed Switches. The vulnerability allows an unauthenticated remote attacker to escape the restricted CLI interface and achieve full device compromise by exploiting a hidden function. The advisory lists specific affected firmware and hardware versions, and notes that the vulnerability has a CVSS v3.1 score of 10.0.

Organizations utilizing these WAGO switches, particularly in critical infrastructure sectors such as Commercial Facilities, Critical Manufacturing, Energy, and Transportation Systems, should immediately review their firmware versions against the advisory's list. While no specific compliance deadline is provided, it is imperative to implement mitigation strategies, which typically involve updating firmware to a non-vulnerable version as soon as possible. Failure to address this critical vulnerability could lead to severe operational disruptions and security breaches.

What to do next

  1. Review firmware versions of WAGO Industrial Managed Switches against the advisory list.
  2. Update affected WAGO switch firmware to a non-vulnerable version as recommended by the vendor.
  3. Implement network segmentation and access controls to limit potential attack vectors.

Source document (simplified)

ICS Advisory

WAGO GmbH & Co. KG Industrial Managed Switches

Release Date

March 26, 2026

Alert Code ICSA-26-085-01 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems 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 WAGOHardware852-1812 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.1.S0 WAGOHardware852-1813 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.3.S0 WAGOHardware852-1813/000-001 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.1.S0 WAGOHardware852-1816 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.8.S0 WAGOHardware852-303 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.0.S0 WAGOHardware852-1305 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.0.S0 WAGOHardware852-1305/000-001 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.0.S0 WAGOHardware852-1505/000-001 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.1.9.S0 WAGOHardware852-1505 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.0.6.S0 WAGOHardware852-602 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.0.6.S0 WAGOHardware852-603 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.5.S0 WAGOHardware852-1605 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.1.S0 WAGOHardware852-1812/010-000 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.1.S0 WAGOHardware852-1813/010-000 (CVE-2026-3587)
  • WAGO Firmware versions prior to V1.2.1.S0 WAGOHardware852-1816/010-000 (CVE-2026-3587)
  • WAGO Firmware version V1.0.6.S0 WAGOHardware852-602 (CVE-2026-3587)
  • WAGO Firmware version V1.0.6.S0 WAGOHardware852-603 (CVE-2026-3587)
  • WAGO Firmware version V1.1.9.S0 WAGOHardware852-1505 (CVE-2026-3587)
  • WAGO Firmware version V1.2.0.S0 WAGOHardware852-1305 (CVE-2026-3587)
  • WAGO Firmware version V1.2.0.S0 WAGOHardware852-1305/000-001 (CVE-2026-3587)
  • WAGO Firmware version V1.2.0.S0 WAGOHardware852-1505/000-001 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S0 WAGOHardware852-1812 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S0 WAGOHardware852-1813 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S0 WAGOHardware852-1816 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S0 WAGOHardware852-1812/010-000 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S0 WAGOHardware852-1813/010-000 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S0 WAGOHardware852-1816/010-000 (CVE-2026-3587)
  • WAGO Firmware version V1.2.3.S0 WAGOHardware852-1813/000-001 (CVE-2026-3587)
  • WAGO Firmware version V1.2.5.S0 WAGOHardware852-1605 (CVE-2026-3587)
  • WAGO Firmware version V1.2.8.S0 WAGOHardware852-303 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S0 WAGOHardware852-1813/010-001 (CVE-2026-3587)
  • WAGO Firmware version V1.2.1.S1 WAGOHardware852-1813/010-001 (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: WAGOHardware852-1812, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGOHardware852-1813, WAGO WAGO Firmware versions prior to V1.2.3.S0: WAGOHardware852-1813/000-001, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGOHardware852-1816, WAGO WAGO Firmware versions prior to V1.2.8.S0: WAGOHardware852-303, WAGO WAGO Firmware versions prior to V1.2.0.S0: WAGOHardware852-1305, WAGO WAGO Firmware versions prior to V1.2.0.S0: WAGOHardware852-1305/000-001, WAGO WAGO Firmware versions prior to V1.2.0.S0: WAGOHardware852-1505/000-001, WAGO WAGO Firmware versions prior to V1.1.9.S0: WAGOHardware852-1505, WAGO WAGO Firmware versions prior to V1.0.6.S0: WAGOHardware852-602, WAGO WAGO Firmware versions prior to V1.0.6.S0: WAGOHardware852-603, WAGO WAGO Firmware versions prior to V1.2.5.S0: WAGOHardware852-1605, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGOHardware852-1812/010-000, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGOHardware852-1813/010-000, WAGO WAGO Firmware versions prior to V1.2.1.S0: WAGOHardware852-1816/010-000, WAGO WAGO Firmware version V1.0.6.S0: WAGOHardware852-602, WAGO WAGO Firmware version V1.0.6.S0: WAGOHardware852-603, WAGO WAGO Firmware version V1.1.9.S0: WAGOHardware852-1505, WAGO WAGO Firmware version V1.2.0.S0: WAGOHardware852-1305, WAGO WAGO Firmware version V1.2.0.S0: WAGOHardware852-1305/000-001, WAGO WAGO Firmware version V1.2.0.S0: WAGOHardware852-1505/000-001, WAGO WAGO Firmware version V1.2.1.S0: WAGOHardware852-1812, WAGO WAGO Firmware version V1.2.1.S0: WAGOHardware852-1813, WAGO WAGO Firmware version V1.2.1.S0: WAGOHardware852-1816, WAGO WAGO Firmware version V1.2.1.S0: WAGOHardware852-1812/010-000, WAGO WAGO Firmware version V1.2.1.S0: WAGOHardware852-1813/010-000, WAGO WAGO Firmware version V1.2.1.S0: WAGOHardware852-1816/010-000, WAGO WAGO Firmware version V1.2.3.S0: WAGOHardware852-1813/000-001, WAGO WAGO Firmware version V1.2.5.S0: WAGOHardware852-1605, WAGO WAGO Firmware version V1.2.8.S0: WAGOHardware852-303, WAGO WAGO Firmware version V1.2.1.S0: WAGOHardware852-1813/010-001, WAGO WAGO Firmware version V1.2.1.S1: WAGOHardware852-1813/010-001 Product Status:
known_affected

Remediations

Mitigation
WAGO 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.

Mitigation
Lean 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.

Mitigation
Industrial 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.

Mitigation
The 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

Mitigation
Firmware V1.2.1.S1 installed on Lean Managed Switch 852-1813 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.3.S1 installed on Lean Managed Switch 852-1813/000-001 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.1.S1 installed on Lean Managed Switch 852-1816 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.8.S1 installed on Industrial Managed Switch 852-303 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.0.S1 installed on Industrial Managed Switch 852-1305 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.0.S1 installed on Industrial Managed Switch 852-1305/000-001 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.0.S1 installed on Industrial Managed Switch 852-1505/000-001 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.1.9.S1 installed on Industrial Managed Switch 852-1505 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.0.6.S1 installed on Industrial Managed Switch 852-602 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.0.6.S1 installed on Industrial Managed Switch 852-603 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.5.S1 installed on Industrial Managed Switch 852-1605 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.1.S1 installed on Lean Managed Switch 852-1812/010-000 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.1.S1 installed on Lean Managed Switch 852-1813/010-000 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.1.S1 installed on Lean Managed Switch 852-1816/010-000 are fixed versions for CVE-2026-3587

Mitigation
Firmware V1.2.1.S1 installed on Lean Managed Switch 852-1813/010-001 are fixed versions for CVE-2026-3587

Mitigation
For 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

Mitigation
For 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

Mitigation
For 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

This product is provided subject to this Notification and this Privacy & Use policy.

Vendor

  • WAGO

Tags

Sector: Commercial Facilities Sector, Critical Manufacturing Sector, Energy Sector, Transportation Systems Sector Topics: Industrial Control System Vulnerabilities, Industrial Control Systems

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Source

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Analysis generated by AI. Source diff and links are from the original.

Classification

Agency
CISA
Published
March 26th, 2026
Instrument
Notice
Legal weight
Non-binding
Stage
Final
Change scope
Substantive
Document ID
ICSA-26-085-01

Who this affects

Applies to
Energy companies Transportation companies Commercial Facilities
Industry sector
3254 Pharmaceutical Manufacturing 2210 Electric Utilities 4811 Air Transportation
Activity scope
Industrial Control Systems Management Network Device Security
Geographic scope
United States US

Taxonomy

Primary area
Cybersecurity
Operational domain
IT Security
Compliance frameworks
NIST CSF
Topics
Industrial Control Systems Vulnerability Disclosure

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