---
id: "CVE-2026-10137"
kind: "vulnerability"
aliases: ["CVE-2026-10137"]
title: "TOTOLINK X2000R router: stack overflow in upload handler allows code execution"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "TOTOLINK X2000R", "fixed": [], "affected": "TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327", "ecosystem": "firmware"}]
ecosystems: []
tags: ["embedded", "infrastructure", "routers", "totolink", "x2000r"]
not_affected_if: ["auth-required", "no-web-admin-exposure", "other-models"]
published_at: "2026-10-20T21:17:16+00:00"
first_seen_at: "2026-10-23T21:57:21+00:00"
updated_at: "2026-10-23T23:16:55+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-10137", "first_seen_at": "2026-10-23T21:57:21+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:16:55+00:00"}]
---

# TOTOLINK X2000R router: stack overflow in upload handler allows code execution

Stack buffer overflow in the boa web server's formUpload() on the TOTOLINK X2000R. After login, a long devicemacN POST parameter (used when mesh mode is on) is strcpy'd into a fixed stack buffer with no length check, giving code execution on the router. It needs valid admin credentials (CVSS PR:H). Talos found it and reported it to the vendor on 2026-06-16. The vendor acknowledged it on 2026-06-25, and no patch is listed.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- firmware:TOTOLINK X2000R affected TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 fixed ?

## How to check

Open the router admin page (Status or System) and read the firmware version. TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 is confirmed vulnerable. Check whether the web admin is reachable from WAN, for example by scanning your public IP on the admin port (80/8080).

## Fix

No fixed firmware published as of 2026-10-23; unknown. Check https://www.totolink.net/home/menu/newstpl/menu_newstpl/products/id/242.html for newer firmware. Until then, turn off remote/WAN administration, restrict the admin UI to LAN, change the default admin password, and avoid untrusted devices on the LAN.

## Timeline

- 2026-10-23T21:57:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-10137
- 2026-10-23T23:16:55+00:00 analyst — Read Talos TALOS-2026-2437 (primary). Only firmware B20250421.1327 confirmed vulnerable; no vendor fix: Totolink acknowledged 2026-06-25 but no patch in timeline through 2026-09-15. No PoC or exploitation found; sibling Talos X2000R CVEs (10136, 10138) share formUpload. Did not search social.

## Documents

- [advisory] TALOS-2026-2437: Totolink X2000R boa formUpload() stack-based buffer overflow https://talosintelligence.com/vulnerability_reports/TALOS-2026-2437
- [mentions] NVD CVE-2026-10137 https://nvd.nist.gov/vuln/detail/CVE-2026-10137

## From the sources

A stack-based buffer overflow vulnerability exists in the boa formUpload() 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_