{"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/tags/cve-2026-5689/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":7.3,"id":"CVE-2026-5689"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["command-injection","router","totolink","cve-2026-5689"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA command injection vulnerability, identified as CVE-2026-5689, affects Totolink A7100RU devices running firmware version 7.4cu.2313_b20191024. The vulnerability is located within the \u003ccode\u003esetNtpCfg\u003c/code\u003e function of the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e file. An attacker can exploit this flaw by manipulating the \u003ccode\u003etz\u003c/code\u003e argument, injecting and executing arbitrary operating system commands. Given that a public exploit is available, unpatched Totolink A7100RU devices are at high risk of compromise. This vulnerability allows unauthenticated remote attackers to gain unauthorized access and control over the affected device.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn unauthenticated attacker sends a crafted HTTP POST request to \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe request targets the \u003ccode\u003esetNtpCfg\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe attacker injects malicious OS commands within the \u003ccode\u003etz\u003c/code\u003e parameter of the HTTP POST request.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003esetNtpCfg\u003c/code\u003e function processes the request without proper sanitization of the \u003ccode\u003etz\u003c/code\u003e parameter.\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 code execution on the device.\u003c/li\u003e\n\u003cli\u003eThe attacker may then install persistent backdoors or malware to maintain access.\u003c/li\u003e\n\u003cli\u003eThe attacker can pivot to other devices on the network, exfiltrate sensitive data, or use the compromised device as part of a botnet.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-5689 allows a remote, unauthenticated attacker to execute arbitrary commands on the affected Totolink A7100RU device. This could lead to complete compromise of the router, allowing the attacker to control network traffic, access sensitive data stored on connected devices, or use the router as a launchpad for further attacks within the network. Given the widespread use of these routers in homes and small businesses, a successful attack could have a significant impact.\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 unusual parameters in the query string, and deploy the Sigma rule \u003ccode\u003eDetect Totolink A7100RU Command Injection Attempt\u003c/code\u003e to detect exploitation attempts.\u003c/li\u003e\n\u003cli\u003eInspect network traffic for command execution patterns originating from the router's IP address, correlating them with requests to the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e endpoint using the \u003ccode\u003eDetect Totolink A7100RU Post Exploitation Activity\u003c/code\u003e rule.\u003c/li\u003e\n\u003cli\u003eApply the latest firmware updates from Totolink as soon as they become available to patch CVE-2026-5689 (if a patch becomes available).\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-06T23:16:30Z","date_published":"2026-04-06T23:16:30Z","id":"https://feed.craftedsignal.io/briefs/2026-04-06-totolink-command-injection/","summary":"A command injection vulnerability exists in Totolink A7100RU firmware version 7.4cu.2313_b20191024, allowing remote attackers to execute arbitrary OS commands by manipulating the 'tz' argument in the setNtpCfg function within the /cgi-bin/cstecgi.cgi file.","title":"Totolink A7100RU Command Injection Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-06-totolink-command-injection/"}],"language":"en","title":"CraftedSignal Threat Feed - Cve-2026-5689","version":"https://jsonfeed.org/version/1.1"}