{"id":"CVE-2026-42021","published":"2026-10-20T21:17:19.140","lastModified":"2026-10-23T23:17:43.620","description":"Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configuration functionality of Totolink X2000R 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 static_dns1 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-2026-2395","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"Stack-based buffer overflow in the formIpv6Setup function of Totolink X2000R firmware allows authenticated remote code execution via a malicious static_dns1 parameter in an HTTP request.","exploitability":"Exploitation requires valid authentication and sending a specially crafted HTTP request to the static network configuration endpoint; no public exploit exists yet, but the vulnerability is straightforward for an attacker with credentials.","blast_radius":"Successful exploitation grants full system compromise (confidentiality, integrity, availability) on the device, potentially enabling lateral movement within the local network.","remediation":"Upgrade to firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 or later, as this is the only fixed version referenced in the description.","detection":"No reliable host or network indicator is derivable from the published description.","tags":["rce","buffer-overflow","auth-required","web-app","embedded-device"],"model":"garnet-coder","analyzedAt":"2026-10-25T08:52:27.443Z"}}