{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","favicon":"https://feed.craftedsignal.io/favicon-32x32.png","feed_url":"https://feed.craftedsignal.io/vendors/snap7/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":["cpe:2.3:a:snap7_project:snap7:*:*:*:*:*:*:*:*"],"_cs_cves":[],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["snap7 (\u003c= 1.4.3)"],"_cs_severities":["high"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":["Snap7"],"content_html":"\u003cp\u003eSnap7, a popular open-source communication suite for interfacing with Siemens S7 PLCs, contains an out-of-bounds write vulnerability in the TSnap7MicroClient::opReadArea() function. This vulnerability, tracked as CVE-2026-111280, affects all versions up to and including 1.4.3. The flaw exists due to insufficient validation of the DataLength field returned by an S7 peer. A rogue or impersonated PLC can provide a specially crafted ReadVar response, forcing the library to execute a memcpy operation of up to 65535 bytes into a fixed-size caller buffer. This condition enables memory corruption or arbitrary code execution within the context of the calling SCADA, HMI, or industrial gateway process, significantly impacting industrial control system stability and integrity.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation allows for memory corruption within applications consuming the Snap7 library. This can result in denial-of-service via process crashes of critical HMI or SCADA software, or potentially arbitrary code execution by overwriting adjacent memory structures. Given the library's role as a bridge between management systems and industrial hardware, exploitation risks the reliability of industrial communication channels and the availability of control operations.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritized, concrete actions for detection engineering and security teams:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eUpdate all software implementations utilizing the Snap7 library to version 1.4.4 or later immediately.\u003c/li\u003e\n\u003cli\u003eAudit industrial networks for unauthorized or rogue PLC devices capable of spoofing S7 communication protocol responses.\u003c/li\u003e\n\u003cli\u003eMonitor logs for unusual process crashes in software integrations (e.g., HMI/SCADA services) that interface with S7 hardware, particularly following network communication events.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-10-15T22:49:58Z","date_published":"2026-10-15T22:49:58Z","id":"https://feed.craftedsignal.io/briefs/2026-10-snap7-oob-write/","summary":"Snap7 versions up to 1.4.3 contain an out-of-bounds write vulnerability in TSnap7MicroClient::opReadArea() triggered by malicious S7 peer responses, potentially leading to memory corruption or process crashes.","title":"Out-of-Bounds Write Vulnerability in Snap7","url":"https://feed.craftedsignal.io/briefs/2026-10-snap7-oob-write/"}],"language":"en","title":"CraftedSignal Threat Feed - Snap7","version":"https://jsonfeed.org/version/1.1"}