# CVE-2004-0276: Denial of service in n/a

> Remote attackers can crash the Monkey HTTP Daemon by sending a malformed HTTP request with percent characters and no Host header.

- **Severity:** Medium 5.0 (`AV:N/AC:L/Au:N/C:N/I:N/A:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 1 Sep 2004
- **Updated:** 8 Aug 2024
- **Also known as:** GHSA-j966-frr2-8mv3

## What is CVE-2004-0276?

CVE-2004-0276 is a medium-severity denial of service vulnerability in n/a, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The get_real_string function in Monkey HTTP Daemon (monkeyd) 0.8.1 and earlier allows remote attackers to cause a denial of service (crash) via an HTTP request with a sequence of "%" characters and a missing Host field.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2004-0276?

It affects 1 product.


Products: Monkey-Project Monkey.

## How do I fix CVE-2004-0276?

No fix has been published for CVE-2004-0276 yet. Limit exposure of the affected software until one is available.

## Is CVE-2004-0276 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2004-0276 exists.

Public exploit code:

- Monkey HTTP Daemon 0.x - Missing Host Field Denial of Service (exploitdb)

## Other vulnerabilities in n/a

- [CVE-2013-2159](https://insights.sbomify.com/CVE-2013-2159/): Auth bypass in monkey (critical 9.8)
- [CVE-2025-63649](https://insights.sbomify.com/CVE-2025-63649/): Denial of service in n/a (high 7.5)
- [CVE-2025-63650](https://insights.sbomify.com/CVE-2025-63650/): Denial of service in n/a (high 7.5)
- [CVE-2025-63651](https://insights.sbomify.com/CVE-2025-63651/): Use after free in n/a (high 7.5)
- [CVE-2025-63652](https://insights.sbomify.com/CVE-2025-63652/): Use after free in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2004-0276 and fix it if it is affected.

What it is: CVE-2004-0276 is a medium-severity denial of service vulnerability in n/a, published on 1 Sep 2004. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2004-0276 exists.

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-2004-0276/ (Markdown: https://insights.sbomify.com/CVE-2004-0276/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2004-0276
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2004-0276
- OSV: https://osv.dev/vulnerability/CVE-2004-0276

---
From sbomify Insights: https://insights.sbomify.com/CVE-2004-0276/
Summaries are generated and may contain mistakes; the official description above is the record.