{"id":"CVE-2026-10139","published":"2026-10-20T21:17:16.720","lastModified":"2026-10-23T23:17:42.177","description":"A stack-based buffer overflow vulnerability exists in the Mcli 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 this vulnerability.","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-2026-2439","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":{"summary":"A stack-based buffer overflow in the Mcli HTTP endpoint of TOTOLINK X2000R allows authenticated attackers to overwrite stack memory and achieve remote code execution via a malicious request.","exploitability":"Exploitation requires valid authentication and sending a specially crafted HTTP request to the vulnerable Mcli endpoint; no public exploit exists yet, but the high CVSS score indicates low technical barrier once the vector is known.","blast_radius":"Successful exploitation grants full system compromise (confidentiality, integrity, availability) on the device, potentially enabling pivot to internal networks or persistent access.","remediation":"Upgrade to TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 or later; if no fixed version is available, disable the Mcli HTTP interface and restrict administrative access to trusted IPs.","detection":"Monitor for unusually long HTTP POST/GET requests to /mcli or similar Mcli endpoints with excessive header/body lengths exceeding typical CLI command sizes; look for anomalous memory access patterns in firmware logs if available.","tags":["stack-overflow","rce","authenticated","web","embedded"],"model":"garnet-coder","analyzedAt":"2026-10-25T08:50:51.408Z"}}