--- title: "CVE-2026-40615: TOTOLINK X2000R - Buffer Overflow" description: "TOTOLINK X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 contains a stack-based buffer overflow caused by improper handling in formParentControl deviceName functionality, letting authenticated attackers execute arbitrary code remotely, exploit requires authenticated HTTP request." url: https://panop.io/threat-heartbeat/CVE-2026-40615/ --- # CVE-2026-40615 TOTOLINK X2000R - Buffer Overflow TOTOLINK X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 contains a stack-based buffer overflow caused by improper handling in formParentControl deviceName functionality, letting authenticated attackers execute arbitrary code remotely, exploit requires authenticated HTTP request. CVSS base score 9.1 /10 Critical CISA KEV Not listed Public exploit None known Authentication Required [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-40615) ## Details Type Buffer Overflow Impact Remote Code Execution CVSS vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H Published 20 October 2026 Updated 21 October 2026 Weakness [CWE-121](https://cwe.mitre.org/data/definitions/121.html) ## Vendor fix Update to the latest available version. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-40615](https://nvd.nist.gov/vuln/detail/CVE-2026-40615) - [https://talosintelligence.com/vulnerability\_reports/TALOS-2026-2393](https://talosintelligence.com/vulnerability_reports/TALOS-2026-2393) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)