{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-7240/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":9.8,"id":"CVE-2026-7240"}],"_cs_exploited":false,"_cs_products":["A8000RU 7.1cu.643_b20200521"],"_cs_severities":["critical"],"_cs_tags":["cve-2026-7240","command-injection","totolink","router","cgi"],"_cs_type":"advisory","_cs_vendors":["Totolink"],"content_html":"\u003cp\u003eA critical vulnerability, CVE-2026-7240, has been identified in Totolink A8000RU router firmware version 7.1cu.643_b20200521. This flaw resides within the CGI Handler component, specifically in the \u003ccode\u003esetVpnAccountCfg\u003c/code\u003e function of the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e file. By exploiting this vulnerability, a remote attacker can inject arbitrary operating system commands by manipulating the \u003ccode\u003eUser\u003c/code\u003e argument. Publicly available exploit code exists, increasing the risk of widespread exploitation. This vulnerability poses a significant threat as it allows complete control of the affected device, potentially leading to network compromise and data exfiltration.\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 accessible via the web interface.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request targeting the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe crafted request includes the \u003ccode\u003esetVpnAccountCfg\u003c/code\u003e function call with a payload injected into the \u003ccode\u003eUser\u003c/code\u003e argument. The payload contains OS commands to be executed on the router.\u003c/li\u003e\n\u003cli\u003eThe router\u0026rsquo;s CGI Handler processes the request without proper sanitization of the \u003ccode\u003eUser\u003c/code\u003e argument.\u003c/li\u003e\n\u003cli\u003eThe injected OS commands are executed with the privileges of the web server process.\u003c/li\u003e\n\u003cli\u003eThe attacker gains remote shell access to the router.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the compromised router to pivot within the network, potentially accessing sensitive data or other internal systems.\u003c/li\u003e\n\u003cli\u003eThe attacker could modify the router\u0026rsquo;s configuration, intercept network traffic, or use it as a launching point for further attacks.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-7240 allows a remote, unauthenticated attacker to execute arbitrary commands on the affected Totolink A8000RU router. This could lead to a complete compromise of the device, potentially exposing sensitive information, enabling unauthorized network access, and facilitating further attacks within the network. Given the ease of exploitation and the availability of public exploits, organizations using this router model are at high risk of experiencing significant security breaches.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eDetect Totolink A8000RU Command Injection Attempt\u003c/code\u003e to identify exploitation attempts against vulnerable Totolink routers. Enable webserver logging to capture the necessary request data.\u003c/li\u003e\n\u003cli\u003eApply the Sigma rule \u003ccode\u003eDetect Totolink A8000RU Malicious User Agent\u003c/code\u003e to detect potential exploit attempts based on modified User-Agent headers.\u003c/li\u003e\n\u003cli\u003eMonitor webserver logs for requests to \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e containing suspicious characters or command sequences in the \u003ccode\u003ecs-uri-query\u003c/code\u003e field, indicative of command injection attempts.\u003c/li\u003e\n\u003cli\u003eGiven the public availability of exploit code, organizations using the Totolink A8000RU 7.1cu.643_b20200521 are advised to replace the device if a patch is not available from the vendor.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-28T08:16:02Z","date_published":"2026-04-28T08:16:02Z","id":"/briefs/2026-04-totolink-cmd-injection/","summary":"CVE-2026-7240 is a critical OS command injection vulnerability in the Totolink A8000RU router that allows remote attackers to execute arbitrary commands by manipulating the 'User' argument in the 'setVpnAccountCfg' function.","title":"Totolink A8000RU OS Command Injection Vulnerability (CVE-2026-7240)","url":"https://feed.craftedsignal.io/briefs/2026-04-totolink-cmd-injection/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-7240","version":"https://jsonfeed.org/version/1.1"}