{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/products/a8000ru/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-7241"}],"_cs_exploited":false,"_cs_products":["A8000RU"],"_cs_severities":["critical"],"_cs_tags":["cve-2026-7241","command-injection","router"],"_cs_type":"advisory","_cs_vendors":["Totolink"],"content_html":"\u003cp\u003eA critical vulnerability, CVE-2026-7241, has been identified in Totolink A8000RU router firmware version 7.1cu.643_b20200521. This vulnerability resides within the CGI Handler component, specifically in the \u003ccode\u003esetWiFiBasicCfg\u003c/code\u003e function of the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e file. Successful exploitation allows a remote attacker to inject and execute arbitrary operating system commands by manipulating the \u003ccode\u003ewifiOff\u003c/code\u003e argument. The vulnerability has been publicly disclosed, increasing the risk of exploitation. This poses a significant threat to users of the affected router model, potentially leading to complete system compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a Totolink A8000RU router running firmware version 7.1cu.643_b20200521.\u003c/li\u003e\n\u003cli\u003eThe attacker sends a crafted HTTP request to the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe HTTP request targets the \u003ccode\u003esetWiFiBasicCfg\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe attacker injects malicious OS commands into the \u003ccode\u003ewifiOff\u003c/code\u003e argument of the HTTP request.\u003c/li\u003e\n\u003cli\u003eThe CGI handler processes the request without proper sanitization of the \u003ccode\u003ewifiOff\u003c/code\u003e argument.\u003c/li\u003e\n\u003cli\u003eThe injected OS commands are executed by the system with the privileges of the web server.\u003c/li\u003e\n\u003cli\u003eThe attacker gains remote shell access or performs other malicious actions, such as modifying router settings.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability allows a remote attacker to execute arbitrary operating system commands on the affected Totolink A8000RU router. This can lead to complete compromise of the device, potentially enabling the attacker to eavesdrop on network traffic, modify router configuration, or use the router as a node in a botnet. Given the widespread use of Totolink routers, a successful attack could impact numerous home and small business networks.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect Totolink A8000RU Command Injection Attempt\u0026rdquo; to your SIEM to identify exploitation attempts targeting the vulnerable endpoint.\u003c/li\u003e\n\u003cli\u003eApply the Sigma rule \u0026ldquo;Detect Suspicious CGI Request Arguments\u0026rdquo; to identify unusual commands in cgi requests.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for requests to \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e with suspicious characters or commands in the \u003ccode\u003ewifiOff\u003c/code\u003e parameter, as this is the attack vector described in CVE-2026-7241.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-28T09:17:41Z","date_published":"2026-04-28T09:17:41Z","id":"/briefs/2026-04-totolink-rce/","summary":"Totolink A8000RU version 7.1cu.643_b20200521 is vulnerable to OS command injection via manipulation of the `wifiOff` argument in the `setWiFiBasicCfg` function of the `/cgi-bin/cstecgi.cgi` CGI handler, allowing a remote attacker to execute arbitrary commands on the system.","title":"Totolink A8000RU OS Command Injection Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-totolink-rce/"},{"_cs_actors":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-7244"}],"_cs_exploited":false,"_cs_products":["A8000RU"],"_cs_severities":["critical"],"_cs_tags":["command injection","router vulnerability","cve-2026-7244"],"_cs_type":"advisory","_cs_vendors":["Totolink"],"content_html":"\u003cp\u003eA critical security vulnerability, identified as CVE-2026-7244, has been discovered in Totolink A8000RU router firmware version 7.1cu.643_b20200521. This flaw resides within the CGI handler, specifically in the \u003ccode\u003esetWiFiEasyGuestCfg\u003c/code\u003e function located in the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e file. By manipulating the \u003ccode\u003emerge\u003c/code\u003e argument, a remote attacker can inject and execute arbitrary operating system commands on the affected device. The vulnerability is remotely exploitable and a proof-of-concept exploit has been publicly released, increasing the risk of widespread exploitation. This poses a significant threat as it allows for complete control over the device, potentially leading to data breaches, network compromise, and botnet recruitment.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker sends a malicious HTTP request to the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e endpoint on the Totolink A8000RU router.\u003c/li\u003e\n\u003cli\u003eThe request targets the \u003ccode\u003esetWiFiEasyGuestCfg\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts the request to include a payload in the \u003ccode\u003emerge\u003c/code\u003e argument designed to inject an OS command.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003ecstecgi.cgi\u003c/code\u003e script processes the request and passes the \u003ccode\u003emerge\u003c/code\u003e argument to a system call without proper sanitization.\u003c/li\u003e\n\u003cli\u003eThe injected OS command is executed with the privileges of the web server.\u003c/li\u003e\n\u003cli\u003eThe attacker gains arbitrary code execution on the router\u0026rsquo;s operating system.\u003c/li\u003e\n\u003cli\u003eThe attacker can then install malware, change router settings, or use the router as a pivot point to attack other devices on the network.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-7244 grants an attacker complete control over the vulnerable Totolink A8000RU router. This can lead to a variety of malicious activities, including data exfiltration, denial-of-service attacks, and the installation of persistent backdoors. Given the availability of a public exploit, a large number of devices could be compromised quickly. This could result in widespread botnet infections, impacting home users and small businesses relying on these routers for network connectivity.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor web server logs for requests to \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e with suspicious parameters in the query string, especially related to the \u003ccode\u003emerge\u003c/code\u003e argument to detect exploitation attempts (see rule: \u0026ldquo;Detect Totolink A8000RU Command Injection Attempt\u0026rdquo;).\u003c/li\u003e\n\u003cli\u003eImplement network intrusion detection system (NIDS) rules to identify malicious payloads being sent to the affected endpoint (see rule: \u0026ldquo;Detect Totolink A8000RU Command Injection - Network\u0026rdquo;).\u003c/li\u003e\n\u003cli\u003eApply the Sigma rule \u0026ldquo;Detect Totolink A8000RU Command Injection in Logs\u0026rdquo; to your SIEM to identify successful command injection attempts based on web server logs.\u003c/li\u003e\n\u003cli\u003eMonitor for unusual process execution originating from the web server process, indicating potential exploitation.\u003c/li\u003e\n\u003cli\u003eUnfortunately, a patch is not available so consider migrating to a more secure router.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-28T09:16:17Z","date_published":"2026-04-28T09:16:17Z","id":"/briefs/2026-04-totolink-command-injection/","summary":"A critical OS command injection vulnerability (CVE-2026-7244) exists in the setWiFiEasyGuestCfg function of the /cgi-bin/cstecgi.cgi file in Totolink A8000RU version 7.1cu.643_b20200521, allowing remote attackers to execute arbitrary commands.","title":"Totolink A8000RU Command Injection Vulnerability (CVE-2026-7244)","url":"https://feed.craftedsignal.io/briefs/2026-04-totolink-command-injection/"}],"language":"en","title":"CraftedSignal Threat Feed — A8000RU","version":"https://jsonfeed.org/version/1.1"}