# CVE-2026-7606: TRENDnet TEW-821DAP Firmware Update new_gui_update_firmware data authenticity

> Attackers can bypass firmware authenticity checks to install malicious firmware on end-of-life TRENDnet access points, enabling remote code execution.

- **Severity:** Medium 6.3 (`CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 2 May 2026
- **Updated:** 4 May 2026
- **Also known as:** GHSA-qh66-v678-hhq5

## What is CVE-2026-7606?

CVE-2026-7606 is a medium-severity vulnerability in TRENDnet TEW-821DAP, published on 2 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A weakness has been identified in TRENDnet TEW-821DAP 1.12B01. This issue affects the function find_hwid/new_gui_update_firmware of the component Firmware Update Handler. Executing a manipulation of the argument dest can lead to insufficient verification of data authenticity. The attack can be launched remotely. Attacks of this nature are highly complex. The exploitability is assessed as difficult. The vendor explains: "That firmware version will only work on our hardware version v1.xR. We have already EOL that product 8 years ago and are no longer selling". This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-345 (Insufficient Verification of Data Authenticity)

## Which versions are affected by CVE-2026-7606?

It affects 1 product.


Products: Trendnet Tew-821dap Firmware.

## How do I fix CVE-2026-7606?

No fix has been published for CVE-2026-7606 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-7606 being exploited?

There is no known exploitation of CVE-2026-7606 in the wild and no public exploit code.

## Other vulnerabilities in TRENDnet TEW-821DAP

- [CVE-2026-7607](https://insights.sbomify.com/CVE-2026-7607/): TRENDnet TEW-821DAP Firmware Udpate auto_update_firmware buffer overflow (high 8.7)
- [CVE-2023-51146](https://insights.sbomify.com/CVE-2023-51146/): Memory corruption in n/a (high 8.0)
- [CVE-2023-51147](https://insights.sbomify.com/CVE-2023-51147/): Memory corruption in n/a (high 8.0)
- [CVE-2023-51148](https://insights.sbomify.com/CVE-2023-51148/): Memory corruption in n/a (high 8.0)
- [CVE-2026-7610](https://insights.sbomify.com/CVE-2026-7610/): TRENDnet TEW-821DAP Firmware Update ssi cleartext transmission (medium 6.3)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-7606 and fix it if it is affected.

What it is: CVE-2026-7606 is a medium-severity vulnerability in TRENDnet TEW-821DAP, published on 2 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-7606 in the wild and no public exploit code.

Affected product: TRENDnet TEW-821DAP. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-7606/ (Markdown: https://insights.sbomify.com/CVE-2026-7606/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-7606
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-7606
- OSV: https://osv.dev/vulnerability/CVE-2026-7606

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-7606/
Summaries are generated and may contain mistakes; the official description above is the record.