{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/modicon/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["plc","denial-of-service","industrial-control-system","modicon"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eOn March 23, 2026, Team82 disclosed vulnerabilities affecting Schneider Electric\u0026rsquo;s Modicon M241, M251, and M262 programmable logic controllers (PLCs). These vulnerabilities, if exploited, can lead to a denial-of-service (DoS) condition, impacting the availability of the controller and potentially disrupting industrial processes. The Schneider Electric advisory SEVD-2026-069-01 addresses these issues, which were discovered by Claroty\u0026rsquo;s Team82. Successful exploitation could halt critical operations controlled by these PLCs, affecting various industrial sectors that rely on Schneider Electric\u0026rsquo;s automation solutions. Defenders should review the advisory and implement recommended mitigations to prevent potential disruptions.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003cp\u003eGiven the limited details in the source, the following attack chain is based on common PLC DoS attack vectors:\u003c/p\u003e\n\u003col\u003e\n\u003cli\u003e\u003cstrong\u003eReconnaissance:\u003c/strong\u003e The attacker identifies a Modicon PLC M241/M251/M262 on the target network, potentially through network scanning or passive reconnaissance.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eInitial Access:\u003c/strong\u003e The attacker gains unauthorized access to the PLC\u0026rsquo;s network, potentially through exploiting weak credentials, network misconfigurations, or vulnerabilities in related systems.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eProtocol Exploitation:\u003c/strong\u003e The attacker leverages a vulnerability in the Modbus or other industrial protocol used by the PLC for communication.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eMalicious Command Injection:\u003c/strong\u003e The attacker crafts and sends a series of specially crafted Modbus commands designed to overload the PLC\u0026rsquo;s processing capabilities.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eResource Exhaustion:\u003c/strong\u003e The PLC attempts to process the malicious commands, leading to excessive CPU utilization, memory exhaustion, or other resource depletion.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eDenial-of-Service:\u003c/strong\u003e The PLC becomes unresponsive and unable to execute its control logic, resulting in a denial-of-service condition. This affects the industrial process relying on the PLC.\u003c/li\u003e\n\u003cli\u003e\u003cstrong\u003eProcess Disruption:\u003c/strong\u003e The industrial process controlled by the PLC halts or malfunctions due to the loss of control signals, leading to potential safety hazards, production losses, or equipment damage.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of these vulnerabilities results in a denial-of-service condition on the affected Schneider Electric Modicon PLCs. This can lead to disruption of industrial processes, potential equipment damage, and safety hazards. The exact impact depends on the specific application and the criticality of the controlled processes. Given the wide adoption of Modicon PLCs across various sectors, a successful attack could impact numerous organizations.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReview Schneider Electric\u0026rsquo;s advisory SEVD-2026-069-01 for detailed vulnerability information and recommended mitigations.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to isolate PLCs and other critical industrial control systems.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for suspicious Modbus commands or other anomalous communication patterns related to the Modicon PLCs using the provided Sigma rules.\u003c/li\u003e\n\u003cli\u003eRegularly audit and update PLC firmware to patch known vulnerabilities.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-23T19:15:23Z","date_published":"2026-03-23T19:15:23Z","id":"/briefs/2024-05-modicon-dos/","summary":"Team82 disclosed vulnerabilities in Schneider Electric Modicon Controllers M241, M251, and M262 PLC lines, which can allow an attacker to cause a denial-of-service condition and affect controller availability.","title":"Schneider Electric Modicon PLC Denial-of-Service Vulnerability","url":"https://feed.craftedsignal.io/briefs/2024-05-modicon-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — Modicon","version":"https://jsonfeed.org/version/1.1"}