{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-6168/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-6168"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["totolink","buffer-overflow","cve-2026-6168","router"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA stack-based buffer overflow vulnerability, tracked as CVE-2026-6168, has been identified in TOTOLINK A7000R routers with firmware versions up to 9.1.0u.6115. The vulnerability resides within the \u003ccode\u003esetWiFiEasyGuestCfg\u003c/code\u003e function located in the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e file. Successful exploitation allows a remote attacker to execute arbitrary code on the device. Publicly available exploit code exists, increasing the risk of widespread exploitation. Given the widespread use of TOTOLINK devices, this vulnerability poses a significant threat to home and small business networks. Exploitation is possible with low privileges, as it only requires authentication to the device\u0026rsquo;s web interface.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker authenticates to the TOTOLINK A7000R web interface. This step assumes default credentials or compromised credentials.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP POST request targeting the \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe request includes the \u003ccode\u003esetWiFiEasyGuestCfg\u003c/code\u003e function call.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003essid5g\u003c/code\u003e argument within the POST request is populated with a string exceeding the buffer\u0026rsquo;s capacity.\u003c/li\u003e\n\u003cli\u003eThe vulnerable \u003ccode\u003esetWiFiEasyGuestCfg\u003c/code\u003e function in \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e processes the oversized \u003ccode\u003essid5g\u003c/code\u003e argument without proper bounds checking.\u003c/li\u003e\n\u003cli\u003eThis leads to a stack-based buffer overflow, overwriting adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eThe attacker leverages the overflow to inject and execute arbitrary code on the device.\u003c/li\u003e\n\u003cli\u003eSuccessful code execution can grant the attacker full control of the router, enabling further malicious activities.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-6168 allows a remote attacker to execute arbitrary code on the vulnerable TOTOLINK A7000R device. This can lead to complete compromise of the router, including the ability to intercept network traffic, modify DNS settings, inject malicious scripts into websites, and use the router as a pivot point for further attacks within the network. This vulnerability affects potentially thousands of devices, particularly in home and small business environments.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply firmware updates immediately if TOTOLINK releases a patch for CVE-2026-6168.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for POST requests to \u003ccode\u003e/cgi-bin/cstecgi.cgi\u003c/code\u003e with unusually long \u003ccode\u003essid5g\u003c/code\u003e parameters, using the provided Sigma rule.\u003c/li\u003e\n\u003cli\u003eImplement network intrusion detection systems (IDS) rules to detect attempts to exploit stack-based buffer overflows targeting TOTOLINK devices.\u003c/li\u003e\n\u003cli\u003eRestrict access to the router\u0026rsquo;s web interface to trusted IP addresses, if possible.\u003c/li\u003e\n\u003cli\u003eEnforce strong and unique passwords for all router accounts.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-13T07:16:51Z","date_published":"2026-04-13T07:16:51Z","id":"/briefs/2026-04-totolink-buffer-overflow/","summary":"A stack-based buffer overflow vulnerability (CVE-2026-6168) exists in TOTOLINK A7000R devices up to version 9.1.0u.6115, allowing remote attackers to execute arbitrary code via a crafted ssid5g argument to the setWiFiEasyGuestCfg function in /cgi-bin/cstecgi.cgi.","title":"TOTOLINK A7000R Stack-Based Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-totolink-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-6168","version":"https://jsonfeed.org/version/1.1"}