# CVE-2006-4154: Code injection in n/a

> Attackers can execute arbitrary code on Apache servers using the mod_tcl module via format string vulnerabilities in set_var functions.

- **Severity:** Medium 6.8 (`AV:N/AC:M/Au:N/C:P/I:P/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not stated
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Oct 2006
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-49w2-rrxr-3cwq

## What is CVE-2006-4154?

CVE-2006-4154 is a medium-severity code injection vulnerability in Apache Http Server, published on 16 Oct 2006. It can be exploited over the network, with no action from the victim.

### Official description

Format string vulnerability in the mod_tcl module 1.0 for Apache 2.x allows context-dependent attackers to execute arbitrary code via format string specifiers that are not properly handled in a set_var function call in (1) tcl_cmds.c and (2) tcl_core.c.

## Which versions are affected by CVE-2006-4154?

It affects 1 product.


Products: Apache Http Server.

## How do I fix CVE-2006-4154?

No fix has been published for CVE-2006-4154 yet. Limit exposure of the affected software until one is available.

## Is CVE-2006-4154 being exploited?

There is no known exploitation of CVE-2006-4154 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-2006-4154 and fix it if it is affected.

What it is: CVE-2006-4154 is a medium-severity code injection vulnerability in Apache Http Server, published on 16 Oct 2006. It can be exploited over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2006-4154 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-2006-4154/ (Markdown: https://insights.sbomify.com/CVE-2006-4154/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2006-4154
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2006-4154
- OSV: https://osv.dev/vulnerability/CVE-2006-4154

---
From sbomify Insights: https://insights.sbomify.com/CVE-2006-4154/
Summaries are generated and may contain mistakes; the official description above is the record.