# CVE-2025-8231: D-Link DIR-890L UART Port rgbin hard-coded credentials

> Attackers with physical access can exploit hard-coded UART credentials to gain privileged control over the D-Link DIR-890L router.

- **Severity:** High 7.0 (`CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Jul 2025
- **Updated:** 28 Jul 2025
- **Also known as:** GHSA-85q8-9fqg-6jwh

## What is CVE-2025-8231?

CVE-2025-8231 is a high-severity vulnerability in D-Link DIR-890L, published on 27 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A vulnerability, which was classified as critical, has been found in D-Link DIR-890L up to 111b04. This issue affects some unknown processing of the file rgbin of the component UART Port. The manipulation leads to hard-coded credentials. It is possible to launch the attack on the physical device. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Weakness: CWE-798 (Use of Hard-coded Credentials), CWE-259 (Use of Hard-coded Password)

## Which versions are affected by CVE-2025-8231?

It affects 1 product.


Products: Dlink Dir-890l Firmware.

## How do I fix CVE-2025-8231?

No fix has been published for CVE-2025-8231 yet. Limit exposure of the affected software until one is available.

## Is CVE-2025-8231 being exploited?

There is no known exploitation of CVE-2025-8231 in the wild and no public exploit code.

## Other vulnerabilities in D-Link DIR-890L

- [CVE-2022-30521](https://insights.sbomify.com/CVE-2022-30521/): Memory corruption in n/a (critical 9.8)
- [CVE-2022-29778](https://insights.sbomify.com/CVE-2022-29778/): Hardcoded credentials in n/a (high 8.8)
- [CVE-2023-30063](https://insights.sbomify.com/CVE-2023-30063/): Auth bypass in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-8231 and fix it if it is affected.

What it is: CVE-2025-8231 is a high-severity vulnerability in D-Link DIR-890L, published on 27 Jul 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-8231 in the wild and no public exploit code.

Affected product: D-Link DIR-890L. 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-2025-8231/ (Markdown: https://insights.sbomify.com/CVE-2025-8231/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-8231
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-8231
- OSV: https://osv.dev/vulnerability/CVE-2025-8231

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-8231/
Summaries are generated and may contain mistakes; the official description above is the record.