# CVE-2007-6422: Denial of service in n/a

> Authenticated users can crash Apache child processes via invalid input in mod_proxy_balancer when using threaded MPMs.

- **Severity:** Medium 4.0 (`AV:N/AC:L/Au:S/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 8 Jan 2008
- **Updated:** 7 Aug 2024
- **Also known as:** DEBIAN-CVE-2007-6422, GHSA-qmrc-358m-f76x, MINI-8qjg-hfxc-j9jp

## What is CVE-2007-6422?

CVE-2007-6422 is a medium-severity denial of service vulnerability in Apache Http Server, published on 8 Jan 2008. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

The balancer_handler function in mod_proxy_balancer in the Apache HTTP Server 2.2.0 through 2.2.6, when a threaded Multi-Processing Module is used, allows remote authenticated users to cause a denial of service (child process crash) via an invalid bb variable.

Weakness: CWE-399

## Which versions are affected by CVE-2007-6422?

It affects 1 product.


Products: Apache Http Server.

## How do I fix CVE-2007-6422?

Upgrade to a fixed version.

## Is CVE-2007-6422 being exploited?

There is no known exploitation of CVE-2007-6422 in the wild and no public exploit code.

## Other vulnerabilities in Apache Http Server

- [CVE-2021-42013](https://insights.sbomify.com/CVE-2021-42013/): Apache HTTP Server Path Traversal (critical 9.8, exploited in the wild)
- [CVE-2024-38475](https://insights.sbomify.com/CVE-2024-38475/): Apache HTTP Server Improper Escaping of Output (critical 9.1, exploited in the wild)
- [CVE-2021-40438](https://insights.sbomify.com/CVE-2021-40438/): Apache HTTP Server-Side Request Forgery (SSRF) (critical 9.0, exploited in the wild)
- [CVE-2019-0211](https://insights.sbomify.com/CVE-2019-0211/): Apache HTTP Server Privilege Escalation (high 7.8, exploited in the wild)
- [CVE-2021-41773](https://insights.sbomify.com/CVE-2021-41773/): Apache HTTP Server Path Traversal (high 7.5, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2007-6422 and fix it if it is affected.

What it is: CVE-2007-6422 is a medium-severity denial of service vulnerability in Apache Http Server, published on 8 Jan 2008. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2007-6422 in the wild and no public exploit code.

Affected product: Apache Http Server. 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-2007-6422/ (Markdown: https://insights.sbomify.com/CVE-2007-6422/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2007-6422
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2007-6422
- OSV: https://osv.dev/vulnerability/CVE-2007-6422

---
From sbomify Insights: https://insights.sbomify.com/CVE-2007-6422/
Summaries are generated and may contain mistakes; the official description above is the record.