{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-6157/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-6157"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["cve-2026-6157","buffer-overflow","router","iot"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA critical buffer overflow vulnerability, identified as CVE-2026-6157, has been discovered in Totolink A800R routers running firmware version 4.1.2cu.5137_B20200730. The vulnerability resides within the \u003ccode\u003esetAppEasyWizardConfig\u003c/code\u003e function in the \u003ccode\u003e/lib/cste_modules/app.so\u003c/code\u003e library. Successful exploitation allows remote attackers to potentially execute arbitrary code on the device. Publicly available exploits exist, increasing the risk of widespread exploitation. Routers are often the perimeter defense for networks making them lucrative targets.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable Totolink A800R router with firmware version 4.1.2cu.5137_B20200730 exposed to the internet.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request targeting the \u003ccode\u003esetAppEasyWizardConfig\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe malicious request includes an overly long string as the value for the \u003ccode\u003eapcliSsid\u003c/code\u003e argument.\u003c/li\u003e\n\u003cli\u003eThe router receives the HTTP request and passes the \u003ccode\u003eapcliSsid\u003c/code\u003e argument to the \u003ccode\u003esetAppEasyWizardConfig\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003esetAppEasyWizardConfig\u003c/code\u003e function copies the contents of \u003ccode\u003eapcliSsid\u003c/code\u003e into a fixed-size buffer without proper bounds checking.\u003c/li\u003e\n\u003cli\u003eThe overly long \u003ccode\u003eapcliSsid\u003c/code\u003e string overflows the buffer, overwriting adjacent memory locations.\u003c/li\u003e\n\u003cli\u003eThe attacker carefully crafts the overflowed data to overwrite the return address of the function.\u003c/li\u003e\n\u003cli\u003eWhen the function returns, control is transferred to the attacker\u0026rsquo;s code, leading to arbitrary code execution. This could lead to the installation of malware or complete control of the device.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this buffer overflow vulnerability grants the attacker the ability to execute arbitrary code on the affected Totolink A800R router. This can result in complete compromise of the device, enabling the attacker to intercept network traffic, modify router settings, or use the router as a launching point for further attacks within the network. Given the availability of public exploits, a large number of devices could be vulnerable, making this a high-impact threat.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply any available firmware updates from Totolink to patch CVE-2026-6157.\u003c/li\u003e\n\u003cli\u003eMonitor network traffic for suspicious HTTP requests targeting the \u003ccode\u003esetAppEasyWizardConfig\u003c/code\u003e function, as described in the attack chain. Deploy the provided Sigma rule to detect potential exploitation attempts.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the impact of a compromised router.\u003c/li\u003e\n\u003cli\u003eIf updates are unavailable, consider replacing the vulnerable device.\u003c/li\u003e\n\u003cli\u003eDisable remote management access to the router to reduce the attack surface.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-13T04:26:40Z","date_published":"2026-04-13T04:26:40Z","id":"/briefs/2026-04-totolink-a800r-buffer-overflow/","summary":"A remote buffer overflow vulnerability exists in the Totolink A800R router version 4.1.2cu.5137_B20200730, allowing unauthenticated attackers to potentially execute arbitrary code by overflowing the apcliSsid argument in the setAppEasyWizardConfig function within the /lib/cste_modules/app.so library.","title":"Totolink A800R Remote Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-totolink-a800r-buffer-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-6157","version":"https://jsonfeed.org/version/1.1"}