{"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/products/n600r/feed.json","home_page_url":"https://feed.craftedsignal.io/","icon":"https://feed.craftedsignal.io/apple-touch-icon.png","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":10,"id":"CVE-2026-79911"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["N600R"],"_cs_severities":["critical"],"_cs_tags":[],"_cs_type":"advisory","_cs_vendors":["TOTOLINK"],"content_html":"\u003cp\u003eA critical security vulnerability (CVE-2026-79911) affects the TOTOLINK N600R router, specifically firmware version 4.3.0cu.7647_B20210106. The vulnerability resides within the setSystemConfig function of the /cgi-bin/cstecgi.cgi component, which serves as the router's CGI handler. Attackers can remotely trigger a stack-based buffer overflow by sending a crafted request that manipulates the 'Hostname' argument. Due to the lack of proper bounds checking in the underlying memory operation, the payload can overwrite stack memory, potentially leading to arbitrary code execution or a denial of service (DoS) state. Publicly available exploit material exists, making this a high-risk exposure for any internet-facing N600R devices.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker performs reconnaissance to identify internet-exposed TOTOLINK N600R devices.\u003c/li\u003e\n\u003cli\u003eAttacker crafts a malicious HTTP request targeting the /cgi-bin/cstecgi.cgi endpoint.\u003c/li\u003e\n\u003cli\u003eThe request includes a specially crafted, oversized value for the 'Hostname' parameter.\u003c/li\u003e\n\u003cli\u003eThe router receives the request and passes the input to the setSystemConfig function.\u003c/li\u003e\n\u003cli\u003eThe function fails to perform adequate bounds checking on the 'Hostname' argument before copying it to a stack buffer.\u003c/li\u003e\n\u003cli\u003eThe buffer overflow occurs, overwriting adjacent memory on the stack with the attacker's payload.\u003c/li\u003e\n\u003cli\u003eThe system's execution flow is diverted to the attacker's instructions.\u003c/li\u003e\n\u003cli\u003eFinal objective is achieved, such as establishing persistent access or executing remote commands on the device.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-79911 results in full system compromise, allowing an unauthenticated remote attacker to execute arbitrary code with the privileges of the web service. This could lead to total control over the network traffic passing through the device, unauthorized access to the internal network, or permanent denial of service. The vulnerability has a CVSS base score of 10.0, reflecting the maximum severity for remote exploitation.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cp\u003ePrioritized actions for security and network teams:\u003c/p\u003e\n\u003cul\u003e\n\u003cli\u003eImmediately identify all TOTOLINK N600R devices exposed to the internet.\u003c/li\u003e\n\u003cli\u003eApply the latest firmware patches provided by TOTOLINK if available.\u003c/li\u003e\n\u003cli\u003eIf patching is not possible, restrict access to the web management interface to known, trusted internal IP addresses only.\u003c/li\u003e\n\u003cli\u003eImplement network-level blocking of inbound traffic to /cgi-bin/cstecgi.cgi on edge firewalls.\u003c/li\u003e\n\u003cli\u003eMonitor logs for unusual HTTP POST requests containing exceptionally long 'Hostname' values in the query or body.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-08-26T00:51:12Z","date_published":"2026-08-26T00:51:12Z","id":"https://feed.craftedsignal.io/briefs/2026-08-totolink-n600r-buffer-overflow/","summary":"A critical stack-based buffer overflow in the TOTOLINK N600R router allows unauthenticated remote attackers to achieve arbitrary code execution via the Hostname parameter.","title":"Stack-Based Buffer Overflow in TOTOLINK N600R","url":"https://feed.craftedsignal.io/briefs/2026-08-totolink-n600r-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed - N600R","version":"https://jsonfeed.org/version/1.1"}