{"id":"CVE-2026-42022","published":"2026-10-20T21:17:19.257","lastModified":"2026-10-23T23:17:43.730","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_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-2026-2395","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"The Totolink X2000R router's formIpv6Setup function contains stack-based buffer overflows when processing the static_dns2 parameter in authenticated HTTP requests, allowing an authenticated attacker to overwrite stack memory and potentially execute arbitrary code.","exploitability":"Exploitation requires valid authentication and sending a specially crafted HTTP request targeting the vulnerable static_dns2 parameter; no public exploits are known, but the high CVSS score suggests feasibility for a skilled attacker.","blast_radius":"Successful exploitation could lead to full compromise of the router—including remote code execution, data exfiltration, and service disruption—potentially affecting all devices relying on it for network access.","remediation":"Upgrade to firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 or later if a patched build exists; otherwise, disable the static IPv6 configuration feature or restrict access to the formIpv6Setup endpoint to trusted internal networks only.","detection":"Monitor HTTP POST requests to /formIpv6Setup for unusually long values in the static_dns2 parameter (e.g., >64 characters) and correlate with authenticated sessions; no reliable host-based artefacts are described.","tags":["rce","buffer-overflow","web","authentication","embedded"],"model":"garnet-coder","analyzedAt":"2026-10-25T08:52:36.488Z"}}