{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-5550/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-5550"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["critical"],"_cs_tags":["cve-2026-5550","tenda","buffer-overflow","router"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eA critical stack-based buffer overflow vulnerability, identified as CVE-2026-5550, exists in Tenda AC10 router firmware version 16.03.10.10_multi_TDE01. The vulnerability is located in the \u003ccode\u003efromSysToolChangePwd\u003c/code\u003e function within the \u003ccode\u003e/bin/httpd\u003c/code\u003e binary. A remote attacker can exploit this flaw to overwrite the stack and potentially execute arbitrary code on the affected device. This is achieved by sending a specially crafted request to the device. Successful exploitation could lead to complete system compromise, allowing attackers to gain unauthorized access, control the device, or use it as a foothold for further network intrusion. Given the widespread use of Tenda routers, this vulnerability poses a significant risk to home and small business networks.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a Tenda AC10 router running firmware version 16.03.10.10_multi_TDE01.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request targeting the \u003ccode\u003e/bin/httpd\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe malicious request is designed to overflow the buffer in the \u003ccode\u003efromSysToolChangePwd\u003c/code\u003e function when processing the request parameters.\u003c/li\u003e\n\u003cli\u003eThe overflow overwrites the stack with attacker-controlled data, including the return address.\u003c/li\u003e\n\u003cli\u003eThe \u003ccode\u003ehttpd\u003c/code\u003e process attempts to return from the \u003ccode\u003efromSysToolChangePwd\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eDue to the overwritten return address, execution is redirected to the attacker\u0026rsquo;s code.\u003c/li\u003e\n\u003cli\u003eThe attacker\u0026rsquo;s code executes with the privileges of the \u003ccode\u003ehttpd\u003c/code\u003e process.\u003c/li\u003e\n\u003cli\u003eThe attacker gains control of the device and can perform arbitrary actions, such as modifying router settings, executing commands, or establishing a backdoor.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-5550 allows a remote attacker to gain complete control of the affected Tenda AC10 router. This can lead to data breaches, denial-of-service attacks, or the router being used as part of a botnet. Given the potential for widespread exploitation and the ease with which the vulnerability can be triggered, CVE-2026-5550 poses a high risk to users of the affected Tenda AC10 router model. The attacker could potentially monitor all network traffic passing through the device, steal sensitive information, or use the compromised device to launch attacks against other systems on the network or the internet.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eMonitor web server logs for suspicious POST requests to \u003ccode\u003e/bin/httpd\u003c/code\u003e with abnormally large parameter values that could indicate a buffer overflow attempt targeting the \u003ccode\u003efromSysToolChangePwd\u003c/code\u003e function to trigger the vulnerability (see the related Sigma rule below).\u003c/li\u003e\n\u003cli\u003eSince a patch is not mentioned, consider replacing the affected Tenda AC10 device or isolating it from critical network segments if immediate replacement is not feasible.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rules in this brief to your SIEM and tune for your environment.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-05T08:16:25Z","date_published":"2026-04-05T08:16:25Z","id":"/briefs/2026-04-tenda-ac10-overflow/","summary":"A stack-based buffer overflow vulnerability (CVE-2026-5550) in Tenda AC10 firmware version 16.03.10.10_multi_TDE01 within the /bin/httpd SysToolChangePwd function allows remote attackers to execute arbitrary code.","title":"Tenda AC10 Stack-Based Buffer Overflow Vulnerability","url":"https://feed.craftedsignal.io/briefs/2026-04-tenda-ac10-overflow/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-5550","version":"https://jsonfeed.org/version/1.1"}