{"id":"CVE-2026-42026","published":"2026-10-20T21:17:19.730","lastModified":"2026-10-23T23:17:44.147","description":"Multiple exploitable stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup dhcp_dns functionality of X2000R (version(s): TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327). A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the dhcp_dns2 parameter.","cvssScore":9.1,"cvssSeverity":"CRITICAL","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","cwes":["CWE-121"],"vendors":[],"products":[],"references":[{"url":"https://talosintelligence.com/vulnerability_reports/TALOS-2026-2396","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"Stack-based buffer overflow in the formIpv6Setup dhcp_dns functionality of X2000R router allows authenticated remote attackers to execute arbitrary code via a specially crafted HTTP request containing an overly long dhcp_dns2 parameter.","exploitability":"Exploitation requires valid authenticated access to the device's web interface; no public exploit exists, but the vulnerability is straightforward to trigger once authenticated.","blast_radius":"Successful exploitation grants full system compromise (RCE) with potential for complete device takeover, lateral movement within the local network, and persistent backdoor installation.","remediation":"Upgrade to TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 or later; if no fixed version is available, disable the formIpv6Setup endpoint or restrict access to it via ACLs.","detection":"Look for HTTP POST requests to /formIpv6Setup with an unusually long dhcp_dns2 parameter value (>256 bytes) in web server logs; authentication success followed by such a request may indicate exploitation attempt.","tags":["rce","stack-overflow","web","authenticated","embedded"],"model":"garnet-coder","analyzedAt":"2026-10-25T08:53:07.117Z"}}