Schneider Electric Modicon M241, M251, and M262
Schneider Electric issued a security advisory for CVE-2025-13901, an improper resource shutdown vulnerability affecting Modicon M241, M251, and M262 controllers deployed globally in critical infrastructure. An unauthenticated attacker can send malicious payloads to occupy communication channels, causing partial denial of service on the Machine Expert protocol with a CVSS score of 5.3. Firmware patches are available (M241/M251 v5.4.13.12, M262 v5.4.10.12) alongside mitigation strategies including network isolation and encrypted communications.
Summary
Schneider Electric issued a security advisory for CVE-2025-13901, an improper resource shutdown vulnerability affecting Modicon M241, M251, and M262 controllers deployed globally in critical infrastructure. An unauthenticated attacker can send malicious payloads to occupy communication channels, causing partial denial of service on the Machine Expert protocol with a CVSS score of 5.3. Firmware patches are available (M241/M251 v5.4.13.12, M262 v5.4.10.12) alongside mitigation strategies including network isolation and encrypted communications.
Full text
ICS Advisory Schneider Electric Modicon M241, M251, and M262 Release DateMarch 19, 2026 Alert CodeICSA-26-078-01 Related topics: Industrial Control System Vulnerabilities, Industrial Control Systems View CSAF Summary Successful exploitation of this vulnerability could allow an attacker to cause a denial-of-service condition on the product. The following versions of Schneider Electric Modicon M241, M251, and M262 are affected: Modicon M241 versions prior to 5.4.13.12 Modicon_Controller_M241 Modicon M251 versions prior to 5.4.13.12 Modicon_Controller_M251 Modicon M262 versions prior to 5.4.10.12 Modicon_Controller_M262 CVSS Vendor Equipment Vulnerabilities v3 5.3 Schneider Electric Schneider Electric Modicon M241, M251, and M262 Improper Resource Shutdown or Release Background Critical Infrastructure Sectors: Commercial Facilities, Critical Manufacturing, Energy Countries/Areas Deployed: Worldwide Company Headquarters Location: France Vulnerabilities Expand All + CVE-2025-13901 CWE-404 Improper Resource Shutdown or Release vulnerability exists that could cause partial Denial of Service on Machine Expert protocol when an unauthenticated attacker sends malicious payload to occupy active communication channels. View CVE Details Affected Products Schneider Electric Modicon M241, M251, and M262 Vendor:Schneider Electric Product Version:Schneider Electric Modicon M241 versions prior to 5.4.13.12: Modicon_Controller_M241, Schneider Electric Modicon M251 versions prior to 5.4.13.12: Modicon_Controller_M251, Schneider Electric Modicon M262 versions prior to 5.4.10.12: Modicon_Controller_M262 Product Status:known_affected Remediations MitigationSchneider Electric has identified the following specific workarounds and mitigations users can apply to reduce risk: Modicon Controller M241 Firmware version 5.4.13.12 delivered with EcoStruxure™ Machine Expert v2.5.0.1 includes a fix for this vulnerability and can be installed through Schneider Electric Software Installer available here: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/. On the engineering workstation install v2.5.0.1 of EcoStruxure™ Machine Expert. For help refer to Schneider Electric Software Installer User Guide available here: https://www.se.com/ww/en/download/document/EIO0000005500/. Update Modicon Controller M241 to the latest Firmware and perform reboot. For instructions refer to Modicon M241 Logic Controller, Programming Guide: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/.https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/ MitigationSchneider Electric has identified the following specific workarounds and mitigations users can apply to reduce risk: Modicon Controller M241 Firmware version 5.4.13.12 delivered with EcoStruxure™ Machine Expert v2.5.0.1 includes a fix for this vulnerability and can be installed through Schneider Electric Software Installer available here: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/. On the engineering workstation install v2.5.0.1 of EcoStruxure™ Machine Expert. For help refer to Schneider Electric Software Installer User Guide available here: https://www.se.com/ww/en/download/document/EIO0000005500/. Update Modicon Controller M241 to the latest Firmware and perform reboot. For instructions refer to Modicon M241 Logic Controller, Programming Guide: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/.https://www.se.com/ww/en/download/document/EIO0000005500/ MitigationModicon Controller M251 Firmware version 5.4.13.12 delivered with EcoStruxure™ Machine Expert v2.5.0.1 includes a fix for this vulnerability and can be installed through Schneider Electric Software Installer available here: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/. On the engineering workstation install v2.5.0.1 of EcoStruxure™ Machine Expert. For help refer to Schneider Electric Software Installer User Guide available here: https://www.se.com/ww/en/download/document/EIO0000005500/. Update Modicon Controller M251 to the latest Firmware and perform reboot. For instructions refer to Modicon M251 Logic Controller, Programming Guide: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/.https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/ MitigationModicon Controller M251 Firmware version 5.4.13.12 delivered with EcoStruxure™ Machine Expert v2.5.0.1 includes a fix for this vulnerability and can be installed through Schneider Electric Software Installer available here: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/. On the engineering workstation install v2.5.0.1 of EcoStruxure™ Machine Expert. For help refer to Schneider Electric Software Installer User Guide available here: https://www.se.com/ww/en/download/document/EIO0000005500/. Update Modicon Controller M251 to the latest Firmware and perform reboot. For instructions refer to Modicon M251 Logic Controller, Programming Guide: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/.https://www.se.com/ww/en/download/document/EIO0000005500/ MitigationModicon Controller M262 Firmware version 5.4.10.12 delivered with EcoStruxure™ Machine Expert v2.5 includes a fix for this vulnerability and can be installed through Schneider Electric Software Installer available here: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/. On the engineering workstation install v2.5.0.1 of EcoStruxure™ Machine Expert. For help refer to Schneider Electric Software Installer User Guide available here: https://www.se.com/ww/en/download/document/EIO0000005500/. Update Modicon Controller M262 to the latest Firmware and perform reboot. For instructions refer to Modicon M262 Logic/Motion Controller, Programming Guide: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/.https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/ MitigationModicon Controller M262 Firmware version 5.4.10.12 delivered with EcoStruxure™ Machine Expert v2.5 includes a fix for this vulnerability and can be installed through Schneider Electric Software Installer available here: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/. On the engineering workstation install v2.5.0.1 of EcoStruxure™ Machine Expert. For help refer to Schneider Electric Software Installer User Guide available here: https://www.se.com/ww/en/download/document/EIO0000005500/. Update Modicon Controller M262 to the latest Firmware and perform reboot. For instructions refer to Modicon M262 Logic/Motion Controller, Programming Guide: https://www.se.com/ww/en/download/document/ESEMACS10_INSTALLER/.https://www.se.com/ww/en/download/document/EIO0000005500/ MitigationFor more information see the associated Schneider Electric CPCERT security advisory SEVD-2026-069-01 Improper Resource Shutdown or Release vulnerability in Multiple Products - SEVD-2026-069-01 PDF Version: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2026-069-01&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2026-069-01.pdf. Improper Resource Shutdown or Release vulnerability in Multiple Products - SEVD-2026-069-01 CSAF Version: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2026-069-01&p_enDocType=Security+and+Safety+Notice&p_File_Name=sevd-2026-069-01.json.https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2026-069-01&p_enDocType=Security+and+Safety+Notice&p_File_Name=SEVD-2026-069-01.pdf MitigationAll affected products: If customers choose not to apply the remediation provided above, they should immediately apply the following mitigations to reduce the risk of exploit: Use controllers and devices only in a protected environment to minimize network exposure and ensure that they are not accessible from public internet or untrusted networks. Filter ports and IP through the embedded firewall. Use encrypted communication links. Use VPN (Virtual Private Networks) tunnels if remote access is required. The "Cybersecurity Guidelines for EcoStruxure Machine Exp
Indicators of Compromise
- cve — CVE-2025-13901