# CVE-2026-77988: TRENDnet TEW-823DRU CLI Configuration Tool nvram_get command injection

> Remote attackers can execute arbitrary commands via the nvram_get function in the CLI Configuration Tool of TRENDnet TEW-823DRU routers.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:L/SI:L/SA:L/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 22 Aug 2026
- **Updated:** 24 Aug 2026
- **Also known as:** GHSA-9q3j-g7jc-hfg2

## What is CVE-2026-77988?

CVE-2026-77988 is a medium-severity command injection vulnerability in TRENDnet TEW-823DRU, published on 22 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

A weakness has been identified in TRENDnet TEW-823DRU 1.1.02b01. This vulnerability affects the function nvram_get of the component CLI Configuration Tool. This manipulation causes command injection. The attack is possible to be carried out remotely. The exploit has been made available to the public and could be used for attacks.

Weakness: CWE-77 (Improper Neutralization of Special Elements used in a Command), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2026-77988?


## How do I fix CVE-2026-77988?

No fix has been published for CVE-2026-77988 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-77988 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77988 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-77988 and fix it if it is affected.

What it is: CVE-2026-77988 is a medium-severity command injection vulnerability in TRENDnet TEW-823DRU, published on 22 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-77988 exists.

Affected product: TRENDnet TEW-823DRU. 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-2026-77988/ (Markdown: https://insights.sbomify.com/CVE-2026-77988/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-77988
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-77988
- OSV: https://osv.dev/vulnerability/CVE-2026-77988

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-77988/
Summaries are generated and may contain mistakes; the official description above is the record.