{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-22924/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":9.1,"id":"CVE-2026-22924"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["SIMATIC CN 4100"],"_cs_severities":["medium"],"_cs_tags":["resource-exhaustion","dos","ics","cve-2026-22924"],"_cs_type":"advisory","_cs_vendors":["Siemens"],"content_html":"\u003cp\u003eA vulnerability, CVE-2026-22924, affects Siemens SIMATIC CN 4100 devices running versions prior to V5.0. This security flaw stems from the application\u0026rsquo;s failure to adequately restrict unauthenticated connections. As a result, an attacker can exploit this weakness to trigger resource exhaustion conditions. By overwhelming the system with unauthenticated requests, a malicious actor could disrupt normal operations, perform unauthorized actions, and compromise both the availability and integrity of the SIMATIC CN 4100 device. Successful exploitation could lead to significant operational downtime and potential data breaches. This vulnerability poses a substantial risk to industrial control systems (ICS) environments relying on SIMATIC CN 4100.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a vulnerable SIMATIC CN 4100 device exposed on the network.\u003c/li\u003e\n\u003cli\u003eAttacker establishes an unauthenticated connection to the device.\u003c/li\u003e\n\u003cli\u003eAttacker sends a high volume of requests to a resource-intensive endpoint.\u003c/li\u003e\n\u003cli\u003eThe SIMATIC CN 4100 device attempts to process each request, consuming system resources.\u003c/li\u003e\n\u003cli\u003eThe device\u0026rsquo;s CPU and memory resources become depleted due to the overwhelming number of requests.\u003c/li\u003e\n\u003cli\u003eLegitimate requests from authorized users are delayed or dropped.\u003c/li\u003e\n\u003cli\u003eThe SIMATIC CN 4100 device becomes unresponsive or crashes, leading to a denial-of-service condition.\u003c/li\u003e\n\u003cli\u003eIndustrial processes relying on the SIMATIC CN 4100 device are disrupted or halted.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-22924 can result in a denial-of-service condition on the SIMATIC CN 4100 device, disrupting critical industrial processes. This may lead to operational downtime, financial losses, and potential safety hazards. The vulnerability affects all versions of SIMATIC CN 4100 prior to V5.0, potentially impacting a wide range of industrial sectors that rely on these devices for network communication.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade SIMATIC CN 4100 devices to version V5.0 or later to remediate CVE-2026-22924.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation and access control measures to limit exposure of SIMATIC CN 4100 devices to untrusted networks.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect SIMATIC CN 4100 Unauthenticated Connection Attempts\u0026rdquo; to identify suspicious unauthenticated connection patterns to the device.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic to SIMATIC CN 4100 devices for unusually high connection rates and resource consumption.\u003c/li\u003e\n\u003cli\u003eApply the mitigations recommended by Siemens in their security advisory SSA-032379.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-12T10:18:09Z","date_published":"2026-05-12T10:18:09Z","id":"https://feed.craftedsignal.io/briefs/2026-05-simatic-resource-exhaustion/","summary":"Siemens SIMATIC CN 4100 versions before V5.0 are vulnerable to resource exhaustion due to improper restriction of unauthenticated connections, potentially leading to disruption of operations and unauthorized actions.","title":"Siemens SIMATIC CN 4100 Unauthenticated Resource Exhaustion (CVE-2026-22924)","url":"https://feed.craftedsignal.io/briefs/2026-05-simatic-resource-exhaustion/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-22924","version":"https://jsonfeed.org/version/1.1"}