# CVE-2019-17567: mod_proxy_wstunnel tunneling of non Upgraded connections

> Attackers can bypass authentication and authorization checks on subsequent requests when mod_proxy_wstunnel is configured on non-upgraded connections.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Jun 2021
- **Updated:** 5 Aug 2024
- **Also known as:** AZL-6473, DEBIAN-CVE-2019-17567, GHSA-qf63-wqjv-7x2f, OESA-2023-1222, OESA-2023-1230, UBUNTU-CVE-2019-17567

## What is CVE-2019-17567?

CVE-2019-17567 is a medium-severity missing authorization vulnerability in Apache Http Server, published on 10 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Apache HTTP Server versions 2.4.6 to 2.4.46 mod_proxy_wstunnel configured on an URL that is not necessarily Upgraded by the origin server was tunneling the whole connection regardless, thus allowing for subsequent requests on the same connection to pass through with no HTTP validation, authentication or authorization possibly configured.

Weakness: CWE-444 (Inconsistent Interpretation of HTTP Requests)

## Which versions are affected by CVE-2019-17567?

It affects 5 products.


Products: Apache Http Server, Fedoraproject Fedora, Oracle Enterprise Manager Ops Center, Oracle Instantis Enterprisetrack, Oracle Zfs Storage Appliance Kit.

## How do I fix CVE-2019-17567?

Upgrade to a fixed version.

## Is CVE-2019-17567 being exploited?

There is no known exploitation of CVE-2019-17567 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-2019-17567 and fix it if it is affected.

What it is: CVE-2019-17567 is a medium-severity missing authorization vulnerability in Apache Http Server, published on 10 Jun 2021. 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-2019-17567 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-2019-17567/ (Markdown: https://insights.sbomify.com/CVE-2019-17567/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-17567
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-17567
- OSV: https://osv.dev/vulnerability/CVE-2019-17567

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-17567/
Summaries are generated and may contain mistakes; the official description above is the record.