{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/x5000r-9.1.0u.6369_b20230113/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"cvss":8.8,"id":"CVE-2026-8137"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["X5000R 9.1.0u.6369_B20230113"],"_cs_severities":["high"],"_cs_tags":["cve","buffer overflow","router","remote code execution"],"_cs_type":"threat","_cs_vendors":["Totolink"],"content_html":"\u003cp\u003eA buffer overflow vulnerability, identified as CVE-2026-8137, has been discovered in Totolink X5000R router version 9.1.0u.6369_B20230113. The vulnerability resides within the \u003ccode\u003esub_458E40\u003c/code\u003e function of the \u003ccode\u003e/boafrm/formDdns\u003c/code\u003e file. By manipulating the \u003ccode\u003esubmit-url\u003c/code\u003e argument, a remote attacker can trigger a buffer overflow, potentially leading to arbitrary code execution on the affected device. Public exploits are available, increasing the risk of widespread exploitation. Routers are a critical component of network infrastructure, and successful exploitation could lead to denial of service, data exfiltration, or further network compromise.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eThe attacker identifies a vulnerable Totolink X5000R router running firmware version 9.1.0u.6369_B20230113.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious HTTP request targeting the \u003ccode\u003e/boafrm/formDdns\u003c/code\u003e endpoint.\u003c/li\u003e\n\u003cli\u003eThe malicious request includes a \u003ccode\u003esubmit-url\u003c/code\u003e argument with a payload exceeding the buffer\u0026rsquo;s capacity in the \u003ccode\u003esub_458E40\u003c/code\u003e function.\u003c/li\u003e\n\u003cli\u003eThe router processes the request and attempts to write the overly long \u003ccode\u003esubmit-url\u003c/code\u003e value into the buffer.\u003c/li\u003e\n\u003cli\u003eThe buffer overflow occurs, overwriting adjacent memory regions.\u003c/li\u003e\n\u003cli\u003eThe attacker carefully crafts the overflow payload to overwrite critical function pointers or return addresses.\u003c/li\u003e\n\u003cli\u003eWhen the vulnerable function returns, control is redirected to the attacker\u0026rsquo;s injected code.\u003c/li\u003e\n\u003cli\u003eThe attacker\u0026rsquo;s code executes with the privileges of the web server process, potentially allowing for command execution or further exploitation.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-8137 allows a remote attacker to execute arbitrary code on the affected Totolink X5000R router. This could lead to a variety of negative consequences, including denial of service, unauthorized access to network resources, data exfiltration, or the installation of malware. Given the prevalence of these routers in home and small business networks, a large number of devices could be vulnerable.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply available patches or firmware updates from Totolink to remediate CVE-2026-8137.\u003c/li\u003e\n\u003cli\u003eDeploy the Sigma rule \u0026ldquo;Detect CVE-2026-8137 Exploitation Attempt — Malicious submit-url Parameter\u0026rdquo; to identify exploitation attempts in web server logs.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for requests to \u003ccode\u003e/boafrm/formDdns\u003c/code\u003e with abnormally long \u003ccode\u003esubmit-url\u003c/code\u003e parameters.\u003c/li\u003e\n\u003cli\u003eConsider implementing rate limiting on requests to \u003ccode\u003e/boafrm/formDdns\u003c/code\u003e to mitigate potential denial-of-service attacks.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-05-08T05:16:11Z","date_published":"2026-05-08T05:16:11Z","id":"/briefs/2026-05-totolink-x5000r-bo/","summary":"A buffer overflow vulnerability (CVE-2026-8137) exists in the Totolink X5000R router version 9.1.0u.6369_B20230113, allowing remote attackers to execute arbitrary code via manipulation of the 'submit-url' argument in the /boafrm/formDdns file.","title":"Totolink X5000R Buffer Overflow Vulnerability (CVE-2026-8137)","url":"https://feed.craftedsignal.io/briefs/2026-05-totolink-x5000r-bo/"}],"language":"en","title":"CraftedSignal Threat Feed — X5000R 9.1.0u.6369_B20230113","version":"https://jsonfeed.org/version/1.1"}