{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/codesys-modbus/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["CODESYS Modbus"],"_cs_severities":["medium"],"_cs_tags":["dos","modbus","codesys"],"_cs_type":"advisory","_cs_vendors":["CODESYS"],"content_html":"\u003cp\u003eA vulnerability in CODESYS Modbus allows an unauthenticated, remote attacker to cause a denial-of-service condition. The specific nature of the vulnerability is not detailed, but it resides within the CODESYS Modbus component. This means that systems using CODESYS Modbus for industrial control or automation are potentially vulnerable. While the advisory lacks specific details, the potential disruption to industrial processes due to a denial-of-service warrants attention from security teams.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a target system running CODESYS Modbus.\u003c/li\u003e\n\u003cli\u003eThe attacker sends a specially crafted Modbus request to the target system.\u003c/li\u003e\n\u003cli\u003eThe CODESYS Modbus component receives and processes the malicious request.\u003c/li\u003e\n\u003cli\u003eDue to the vulnerability, the CODESYS Modbus component enters a fault state.\u003c/li\u003e\n\u003cli\u003eThe fault state consumes excessive system resources (CPU, memory).\u003c/li\u003e\n\u003cli\u003eThe system becomes unresponsive or crashes.\u003c/li\u003e\n\u003cli\u003eIndustrial processes controlled by the affected system are disrupted.\u003c/li\u003e\n\u003cli\u003eThe denial-of-service condition persists until the system is manually restarted or patched.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability can lead to a denial of service, disrupting industrial processes and potentially causing financial losses. While the exact number of affected systems is unknown, any organization using CODESYS Modbus is potentially at risk. The impact includes loss of control over industrial equipment, production downtime, and potential safety hazards.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the latest patches and updates for CODESYS Modbus as soon as they become available from the vendor.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for suspicious Modbus requests (see rule \u0026ldquo;Detect Suspicious Modbus Traffic\u0026rdquo;).\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the impact of a potential denial-of-service attack.\u003c/li\u003e\n\u003cli\u003eReview and harden the configuration of CODESYS Modbus installations according to vendor best practices.\u003c/li\u003e\n\u003cli\u003eEnable logging for Modbus traffic and monitor logs for anomalies (see rule \u0026ldquo;Detect CODESYS Modbus DoS Attempt\u0026rdquo;).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-12T10:08:17Z","date_published":"2026-05-12T10:08:17Z","id":"https://feed.craftedsignal.io/briefs/2026-05-codesys-modbus-dos/","summary":"A remote, anonymous attacker can exploit a vulnerability in CODESYS Modbus to perform a denial of service attack.","title":"CODESYS Modbus Vulnerability Enables Denial of Service","url":"https://feed.craftedsignal.io/briefs/2026-05-codesys-modbus-dos/"}],"language":"en","title":"CraftedSignal Threat Feed — CODESYS Modbus","version":"https://jsonfeed.org/version/1.1"}