---
id: "CVE-2026-28763"
kind: "vulnerability"
aliases: ["CVE-2026-28763"]
title: "TOTOLINK X2000R router: stack overflow in device hostname handler allows code execution"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: [{"name": "TOTOLINK X2000R firmware", "fixed": [], "affected": "TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327", "ecosystem": "vendor"}]
ecosystems: []
tags: ["boa", "embedded", "infrastructure", "router", "self-hosted", "totolink", "x2000r"]
not_affected_if: ["auth-required", "not-x2000r", "other-firmware-versions", "web-admin-disabled"]
published_at: "2026-10-20T21:17:18+00:00"
first_seen_at: "2026-10-23T21:57:21+00:00"
updated_at: "2026-10-23T23:15:46+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28763", "first_seen_at": "2026-10-23T21:57:21+00:00"}, {"source": "analyst", "url": null, "first_seen_at": "2026-10-23T23:15:46+00:00"}]
---

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

Stack-based buffer overflow in the boa web server on the TOTOLINK X2000R. formMapDelDevice copies the POST parameter 'hostname' onto a 0x40-byte stack buffer with strcpy, and it only runs when 'hostnameAdd' is non-empty. An authenticated admin session can overwrite the return address and get code execution on the router. Talos found it, and the vendor has not published a fix.

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

## Affected

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

## How to check

In the router admin UI (System > Firmware / Status), read the firmware version. Build TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 is confirmed vulnerable. Other builds are untested, so treat them as possibly affected. Also check whether the admin web interface is reachable from WAN (remote management / port-forwarding of the admin port) and whether the default admin password is still set.

## Fix

No fixed firmware is known. Talos disclosure timeline shows no patch as of 2026-09-15. Mitigate: turn off WAN/remote management, restrict the admin UI to a trusted LAN segment, change default admin credentials, and watch totolink.net for a newer X2000R firmware. Consider replacing the device if no patch ships.

## Timeline

- 2026-10-23T21:57:21+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-28763
- 2026-10-23T23:15:46+00:00 analyst — Read Talos TALOS-2026-2389 (primary). Only build B20250421.1327 confirmed vulnerable; no fixed firmware; vendor acknowledged 2026-06-25 but no patch by 2026-09-15. No exploitation or public PoC found (Talos gives crash details only); did not search X.

## Documents

- [advisory] TALOS-2026-2389 Totolink X2000R formMapDelDevice stack overflow https://talosintelligence.com/vulnerability_reports/TALOS-2026-2389

## From the sources

A stack-based buffer overflow vulnerability exists in the boa formMapDelDevice hostname 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_