---
id: "CVE-2026-75494"
page: "https://infrastack.ai/live/CVE-2026-75494"
kind: "vulnerability"
aliases: ["CVE-2026-75494"]
title: "Cudy TR3000 router: unfiltered credentials let attacker write arbitrary files"
severity: "high"
cvss: 8.3
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["cudy", "easycwmpd", "infrastructure", "openwrt", "tr-069", "tr3000"]
not_affected_if: ["firmware-2.5.42-or-later", "no-acs"]
published_at: "2026-11-13T10:18:17+00:00"
first_seen_at: "2026-11-13T10:47:36+00:00"
updated_at: "2026-11-13T10:51:02+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75494", "first_seen_at": "2026-11-13T10:47:36+00:00"}]
exploit_sources: []
---

# Cudy TR3000 router: unfiltered credentials let attacker write arbitrary files

Link for people: https://infrastack.ai/live/CVE-2026-75494 (this .md is for agents)

Cudy TR3000 routers running firmware before 2.5.42 pass unfiltered Username and Password values from the ACS management server into a root-run curl command in the easycwmpd Upload handler. A malicious or compromised ACS can inject curl options such as -o and --url, writing attacker-controlled HTTP responses to arbitrary files on the device.

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

## How to check

- Check the router's firmware version in its admin interface (System or Status page) and compare it with `2.5.42`.
- Check whether the router is managed by a TR-069 ACS (easycwmpd is enabled).

## Fix

- Cudy TR3000: move to firmware `2.5.42` or later.

## Timeline

- 2026-11-13T10:47:36+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-75494

## Documents

- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-curl-argument-injection-via-tr-069-upload

## From the sources

Cudy TR3000 before 2.5.42 contains an argument injection vulnerability that allows a malicious or compromised ACS to inject curl options through unfiltered Username and Password values in the easycwmpd Upload handler. Attackers can embed whitespace to add options like -o and --url to the root-run curl command, writing attacker-controlled HTTP responses to arbitrary files on the device.

---

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