---
id: "CVE-2026-129352"
page: "https://infrastack.ai/live/CVE-2026-129352"
kind: "vulnerability"
aliases: ["CVE-2026-129352"]
title: "TRENDnet TEW-657BRM router: remote stack overflow in firmware upgrade handler"
severity: "critical"
cvss: 9.1
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["eol-hardware", "infrastructure", "routers", "tew-657brm", "trendnet"]
not_affected_if: ["admin-not-exposed", "device-retired"]
published_at: "2026-11-14T23:16:48+00:00"
first_seen_at: "2026-11-14T23:32:09+00:00"
updated_at: "2026-11-14T23:32:41+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-129352", "first_seen_at": "2026-11-14T23:32:09+00:00"}]
exploit_sources: []
---

# TRENDnet TEW-657BRM router: remote stack overflow in firmware upgrade handler

Link for people: https://infrastack.ai/live/CVE-2026-129352 (this .md is for agents)

The TRENDnet TEW-657BRM router's upgrade_flash.cgi firmware upload handler has a stack-based buffer overflow triggered by a manipulated boundary argument. A remote attacker can likely crash the device or run code on it, and a public exploit is reported.

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

## How to check

- Check whether the router is a TEW-657BRM running firmware 1.00.1, printed on the label or shown in the admin page.
- Check whether the device's web admin interface is reachable from the internet (port forwarding, exposed WAN admin).

## Timeline

- 2026-11-14T23:32:09+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-129352

## From the sources

A vulnerability was detected in TRENDnet TEW-657BRM 1.00.1. This issue affects some unknown processing of the file /usr/sbin/upgrade_flash.cgi. Performing a manipulation of the argument boundary results in stack-based buffer overflow. The attack is possible to be carried out remotely. The exploit is now public and may be used. The vendor explains: ""I am not able to confirm if such vulnerability exists as the product has been EOL for more than 15 years. We will send out an announcement letting customers know."

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_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_