{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-5204/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-5204"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["cve-2026-5204","tenda","buffer-overflow","router"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eCVE-2026-5204 describes a critical stack-based buffer overflow vulnerability affecting Tenda CH22 router version 1.0.0.1. The vulnerability resides within the \u003ccode\u003eformWebTypeLibrary\u003c/code\u003e function in the \u003ccode\u003e/goform/webtypelibrary\u003c/code\u003e file, which handles web-based parameter input. An attacker can exploit this vulnerability by sending a specially crafted HTTP request to the router, manipulating the \u003ccode\u003ewebSiteId\u003c/code\u003e argument to overwrite the stack buffer. This allows for arbitrary code execution on the device. Given the router\u0026rsquo;s role as a network gateway, successful exploitation can lead to complete compromise of the device and potentially the entire network behind it. The availability of a public exploit increases the risk of widespread exploitation.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable Tenda CH22 router running firmware version 1.0.0.1.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP POST request targeting the \u003ccode\u003e/goform/webtypelibrary\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe crafted request includes the \u003ccode\u003ewebSiteId\u003c/code\u003e parameter with a payload exceeding the expected buffer size, triggering the stack-based buffer overflow in the \u003ccode\u003eformWebTypeLibrary\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe overflow overwrites critical data on the stack, including the return address.\u003c/li\u003e\n\u003cli\u003eThe overwritten return address is replaced with the address of malicious code injected into the payload or a pre-existing code location within the router\u0026rsquo;s firmware (Return-Oriented Programming - ROP).\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003eformWebTypeLibrary\u003c/code\u003e function returns, transferring control to the attacker-controlled code.\u003c/li\u003e\n\u003cli\u003eThe attacker\u0026rsquo;s code executes, granting the attacker control over the device.\u003c/li\u003e\n\u003cli\u003eThe attacker can then use this control to further compromise the network or disrupt services.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-5204 allows a remote attacker to execute arbitrary code on the vulnerable Tenda CH22 router. This can lead to complete control of the device, enabling the attacker to intercept network traffic, modify DNS settings, create VPNs, or launch further attacks on devices within the network. Given that routers are essential network devices, a successful attack can have a significant impact, affecting all connected devices and potentially exposing sensitive data.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply available firmware updates for Tenda CH22 routers immediately to patch CVE-2026-5204.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u003ccode\u003eTenda-CH22-WebSiteId-Buffer-Overflow\u003c/code\u003e to detect exploitation attempts targeting the vulnerable endpoint.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious POST requests to \u003ccode\u003e/goform/webtypelibrary\u003c/code\u003e with unusually long \u003ccode\u003ewebSiteId\u003c/code\u003e parameters, as indicated by \u003ccode\u003eWebSiteId_Length_Detection\u003c/code\u003e Sigma rule.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the impact of a potential router compromise.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-31T16:16:35Z","date_published":"2026-03-31T16:16:35Z","id":"/briefs/2026-03-tenda-ch22-bo/","summary":"A stack-based buffer overflow vulnerability (CVE-2026-5204) exists in the Tenda CH22 1.0.0.1 router, allowing remote attackers to execute arbitrary code by manipulating the webSiteId argument in the formWebTypeLibrary function.","title":"Tenda CH22 Stack-Based Buffer Overflow Vulnerability (CVE-2026-5204)","url":"https://feed.craftedsignal.io/briefs/2026-03-tenda-ch22-bo/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-5204","version":"https://jsonfeed.org/version/1.1"}