# CVE-2009-2699: Denial of service in n/a

> Remote attackers can cause a denial of service by hanging the daemon via unspecified HTTP requests due to improper error handling in the APR library.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 13 Oct 2009
- **Updated:** 7 Aug 2024
- **Also known as:** GHSA-2vjp-v45q-4g2x

## What is CVE-2009-2699?

CVE-2009-2699 is a high-severity denial of service vulnerability in Apache Http Server, published on 13 Oct 2009. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The Solaris pollset feature in the Event Port backend in poll/unix/port.c in the Apache Portable Runtime (APR) library before 1.3.9, as used in the Apache HTTP Server before 2.2.14 and other products, does not properly handle errors, which allows remote attackers to cause a denial of service (daemon hang) via unspecified HTTP requests, related to the prefork and event MPMs.

Weakness: CWE-667 (Improper Locking)

## Which versions are affected by CVE-2009-2699?

It affects 2 products.


Products: Apache Http Server, Apache Portable Runtime.

## How do I fix CVE-2009-2699?

Upgrade to a fixed version.

## Is CVE-2009-2699 being exploited?

There is no known exploitation of CVE-2009-2699 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-2009-2699 and fix it if it is affected.

What it is: CVE-2009-2699 is a high-severity denial of service vulnerability in Apache Http Server, published on 13 Oct 2009. 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-2009-2699 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-2009-2699/ (Markdown: https://insights.sbomify.com/CVE-2009-2699/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2009-2699
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2009-2699
- OSV: https://osv.dev/vulnerability/CVE-2009-2699

---
From sbomify Insights: https://insights.sbomify.com/CVE-2009-2699/
Summaries are generated and may contain mistakes; the official description above is the record.