---
id: "CVE-2026-75493"
page: "https://infrastack.ai/live/CVE-2026-75493"
kind: "vulnerability"
aliases: ["CVE-2026-75493"]
title: "Cudy TR3000 router: stack overflow in TR-069 parameter read crashes device"
severity: "high"
cvss: 8.2
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["cudy", "embedded", "infrastructure", "router", "tr-069", "tr3000"]
not_affected_if: ["firmware-2.5.42-or-later", "no-tr-069-acs"]
published_at: "2026-11-13T10:18:16+00:00"
first_seen_at: "2026-11-13T10:47:35+00:00"
updated_at: "2026-11-13T10:51:19+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75493", "first_seen_at": "2026-11-13T10:47:35+00:00"}]
exploit_sources: []
---

# Cudy TR3000 router: stack overflow in TR-069 parameter read crashes device

Link for people: https://infrastack.ai/live/CVE-2026-75493 (this .md is for agents)

Cudy TR3000 routers before 2.5.42 have a stack buffer overflow in the obuspa TR-069 agent when reading the Wi-Fi KeyPassphrase parameter. A malicious or compromised management server (ACS) can set an oversized passphrase and crash the agent, causing denial of service.

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

## How to check

- Check the firmware version on the router's admin page; versions below `2.5.42` are affected.
- Check whether TR-069 / remote management (ACS) is enabled in the router's settings.

## Fix

- Cudy TR3000: firmware `2.5.42` or later (per the description of the affected range).

## Timeline

- 2026-11-13T10:47:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-75493

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-stack-buffer-overflow-via-obuspa-keypassphrase-getter

## From the sources

Cudy TR3000 before 2.5.42 contains a stack buffer overflow vulnerability in an obuspa getter for the TR-098 WLANConfiguration KeyPassphrase parameter, which copies the stored value with strcpy() into a 4,096-byte stack buffer without a length check. A malicious or compromised ACS can set a 5,000-byte passphrase via SetParameterValues, and a later read of the parameter overflows the buffer and crashes obuspa, causing denial of service.

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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_