{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-5567/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-5567"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["cve-2026-5567","buffer-overflow","tenda","router","webserver"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA critical buffer overflow vulnerability has been identified in Tenda M3 router version 1.0.0.10. The vulnerability resides in the \u003ccode\u003esetAdvPolicyData\u003c/code\u003e function within the \u003ccode\u003e/goform/setAdvPolicyData\u003c/code\u003e file, a part of the Destination Handler component. By manipulating the \u003ccode\u003epolicyType\u003c/code\u003e argument, a remote attacker can trigger a buffer overflow, potentially leading to arbitrary code execution. Publicly available exploit code exists, increasing the risk of exploitation. This vulnerability poses a significant threat to organizations utilizing the affected Tenda M3 router, potentially allowing attackers to gain unauthorized access to the network or disrupt services.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAttacker identifies a vulnerable Tenda M3 router exposed to the internet or reachable from their network position.\u003c/li\u003e\n\u003cli\u003eAttacker sends a crafted HTTP POST request to \u003ccode\u003e/goform/setAdvPolicyData\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eThe POST request includes a malicious \u003ccode\u003epolicyType\u003c/code\u003e argument designed to overflow the buffer in the \u003ccode\u003esetAdvPolicyData\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003esetAdvPolicyData\u003c/code\u003e function in \u003ccode\u003e/goform/setAdvPolicyData\u003c/code\u003e processes the \u003ccode\u003epolicyType\u003c/code\u003e argument without proper bounds checking.\u003c/li\u003e\n\u003cli\u003eThe excessive data provided in the \u003ccode\u003epolicyType\u003c/code\u003e argument overwrites adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eThe attacker carefully crafts the overflow to overwrite critical data or inject malicious code into the process\u0026rsquo;s memory space.\u003c/li\u003e\n\u003cli\u003eThe injected code is executed, giving the attacker control over the router.\u003c/li\u003e\n\u003cli\u003eThe attacker can then use the compromised router as a foothold to pivot to other devices on the network, exfiltrate sensitive data, or cause denial of service.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this buffer overflow vulnerability allows a remote attacker to execute arbitrary code on the Tenda M3 router. This could lead to a complete compromise of the device, allowing the attacker to control network traffic, access sensitive information, or use the router as a launchpad for further attacks within the network. Given the severity and the existence of public exploits, vulnerable routers are at high risk of being targeted.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply any available firmware updates from Tenda to patch CVE-2026-5567.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for suspicious POST requests to \u003ccode\u003e/goform/setAdvPolicyData\u003c/code\u003e with unusually long \u003ccode\u003epolicyType\u003c/code\u003e arguments; deploy the Sigma rule \u003ccode\u003eDetect Suspicious PolicyType Argument Length\u003c/code\u003e to identify this activity.\u003c/li\u003e\n\u003cli\u003eImplement network segmentation to limit the potential impact of a compromised router.\u003c/li\u003e\n\u003cli\u003eConsider using a web application firewall (WAF) to filter malicious requests targeting the affected endpoint.\u003c/li\u003e\n\u003cli\u003eReview and restrict access to the router\u0026rsquo;s management interface to authorized personnel only.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-05T13:17:14Z","date_published":"2026-04-05T13:17:14Z","id":"/briefs/2026-04-tenda-m3-overflow/","summary":"A buffer overflow vulnerability exists in Tenda M3 1.0.0.10 via manipulation of the policyType argument in the setAdvPolicyData function, allowing remote attackers to execute arbitrary code.","title":"Tenda M3 Router Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-tenda-m3-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-5567","version":"https://jsonfeed.org/version/1.1"}