# CVE-2026-15487: TRENDnet TEW-821DAP Firmware Update system_ntp sub_41FBD0 os command injection

> Remote attackers can execute arbitrary OS commands via the Hostname argument in the NTP configuration handler of this end-of-life device.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 12 Jul 2026
- **Updated:** 13 Jul 2026
- **Also known as:** GHSA-4pr9-4cff-6c6j

## What is CVE-2026-15487?

CVE-2026-15487 is a medium-severity command injection vulnerability in TRENDnet TEW-821DAP, published on 12 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

A vulnerability was found in TRENDnet TEW-821DAP 1.11B03. This impacts the function sub_41FBD0 of the file /goform/system_ntp of the component Firmware Update Handler. Performing a manipulation of the argument Hostname results in os command injection. The attack may be initiated remotely. The vendor explains: "We are unable to confirm the existence of the vulnerabilities for (...) TEW-821DAP (v1.0R) as these items have been EOL. " This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-78 (Improper Neutralization of Special Elements used in an OS Command), CWE-77 (Improper Neutralization of Special Elements used in a Command)

## Which versions are affected by CVE-2026-15487?


## How do I fix CVE-2026-15487?

No fix has been published for CVE-2026-15487 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-15487 being exploited?

There is no known exploitation of CVE-2026-15487 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-15487 and fix it if it is affected.

What it is: CVE-2026-15487 is a medium-severity command injection vulnerability in TRENDnet TEW-821DAP, published on 12 Jul 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-15487 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-2026-15487/ (Markdown: https://insights.sbomify.com/CVE-2026-15487/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-15487
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-15487
- OSV: https://osv.dev/vulnerability/CVE-2026-15487

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-15487/
Summaries are generated and may contain mistakes; the official description above is the record.