# CVE-2004-0492: Memory corruption in n/a

> Remote attackers can cause a denial of service or potentially execute arbitrary code via a negative Content-Length header in Apache mod_proxy.

- **Severity:** Critical 10.0 (`AV:N/AC:L/Au:N/C:C/I:C/A:C`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Jun 2004
- **Updated:** 8 Aug 2024
- **Also known as:** DSA-525, GHSA-w59m-3c5g-3v9c

## What is CVE-2004-0492?

CVE-2004-0492 is a critical memory corruption vulnerability in Apache Http Server, published on 23 Jun 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Heap-based buffer overflow in proxy_util.c for mod_proxy in Apache 1.3.25 to 1.3.31 allows remote attackers to cause a denial of service (process crash) and possibly execute arbitrary code via a negative Content-Length HTTP header field, which causes a large amount of data to be copied.

## Which versions are affected by CVE-2004-0492?

It affects 7 products.


Products: Apache Http Server, Hp Virtualvault, Hp Vvos, Hp Webproxy, Ibm Http Server, Openbsd Openbsd, Sgi Propack.

## How do I fix CVE-2004-0492?

Upgrade to a fixed version.

## Is CVE-2004-0492 being exploited?

There is no known exploitation of CVE-2004-0492 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-2004-0492 and fix it if it is affected.

What it is: CVE-2004-0492 is a critical memory corruption vulnerability in Apache Http Server, published on 23 Jun 2004. 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-2004-0492 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-2004-0492/ (Markdown: https://insights.sbomify.com/CVE-2004-0492/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2004-0492
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2004-0492
- OSV: https://osv.dev/vulnerability/CVE-2004-0492

---
From sbomify Insights: https://insights.sbomify.com/CVE-2004-0492/
Summaries are generated and may contain mistakes; the official description above is the record.