WAGO GmbH & Co. KG Industrial Managed Switches

Summary

CVE-2026-3587 is a critical (CVSS 10.0) vulnerability in WAGO GmbH & Co. KG industrial managed switches that allows unauthenticated remote attackers to exploit a hidden CLI function to escape the restricted interface and achieve full device compromise. The vulnerability affects 15+ hardware models (852-series) deployed globally across critical infrastructure sectors including energy, manufacturing, and transportation. WAGO has released patched firmware versions (S1 variants) and mitigation guidance including disabling SSH/Telnet.

Full text

ICS Advisory WAGO GmbH & Co. KG Industrial Managed Switches Release DateMarch 26, 2026 Alert CodeICSA-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 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 852-1

Indicators of Compromise

• cve — CVE-2026-3587