# CVE-2009-4821: Auth bypass in n/a

> Remote attackers can bypass authentication to change admin passwords, disable Wi-Fi security, or modify DNS settings on D-Link DIR-615 routers.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:P/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 27 Apr 2010
- **Updated:** 17 Sep 2024
- **Also known as:** GHSA-rvfw-993v-9jc5

## What is CVE-2009-4821?

CVE-2009-4821 is a medium-severity authentication bypass vulnerability in n/a, published on 27 Apr 2010. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The D-Link DIR-615 with firmware 3.10NA does not require administrative authentication for apply.cgi, which allows remote attackers to (1) change the admin password via the admin_password parameter, (2) disable the security requirement for the Wi-Fi network via unspecified vectors, or (3) modify DNS settings via unspecified vectors.

Weakness: CWE-287 (Improper Authentication)

## Which versions are affected by CVE-2009-4821?

It affects 1 product.


Products: Dlink Dir-615.

## How do I fix CVE-2009-4821?

No fix has been published for CVE-2009-4821 yet. Limit exposure of the affected software until one is available.

## Is CVE-2009-4821 being exploited?

There is no known exploitation of CVE-2009-4821 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2017-11436](https://insights.sbomify.com/CVE-2017-11436/): Hardcoded credentials in n/a (critical 9.8)
- [CVE-2017-7405](https://insights.sbomify.com/CVE-2017-7405/): Auth bypass in n/a (critical 9.8)
- [CVE-2017-7406](https://insights.sbomify.com/CVE-2017-7406/): Weak cryptography in n/a (critical 9.8)
- [CVE-2017-7404](https://insights.sbomify.com/CVE-2017-7404/): Cross-site request forgery in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2009-4821 and fix it if it is affected.

What it is: CVE-2009-4821 is a medium-severity authentication bypass vulnerability in n/a, published on 27 Apr 2010. 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-2009-4821 in the wild and no public exploit code.

Affected product: n/a. 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-2009-4821/ (Markdown: https://insights.sbomify.com/CVE-2009-4821/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-4821
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-4821
- OSV: https://osv.dev/vulnerability/CVE-2009-4821

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-4821/
Summaries are generated and may contain mistakes; the official description above is the record.