# CVE-2019-19330: Other in n/a

> HAProxy mishandles HTTP/2 headers, allowing intermediary encapsulation attacks that bypass security controls.

- **Severity:** Critical 9.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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:** 27 Nov 2019
- **Updated:** 5 Aug 2024
- **Also known as:** ALPINE-CVE-2019-19330, DEBIAN-CVE-2019-19330, DSA-4577-1, GHSA-x4px-pm9c-vmjm, UBUNTU-CVE-2019-19330, USN-4212-1

## What is CVE-2019-19330?

CVE-2019-19330 is a critical vulnerability in Canonical Ubuntu Linux, published on 27 Nov 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

The HTTP/2 implementation in HAProxy before 2.0.10 mishandles headers, as demonstrated by carriage return (CR, ASCII 0xd), line feed (LF, ASCII 0xa), and the zero character (NUL, ASCII 0x0), aka Intermediary Encapsulation Attacks.

Weakness: CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2019-19330?

It affects 3 products.


Products: Canonical Ubuntu Linux, Debian Debian Linux, Haproxy Haproxy.

## How do I fix CVE-2019-19330?

Upgrade to a fixed version.

## Is CVE-2019-19330 being exploited?

There is no known exploitation of CVE-2019-19330 in the wild and no public exploit code.

## Other vulnerabilities in Canonical Ubuntu Linux

- [CVE-2020-11651](https://insights.sbomify.com/CVE-2020-11651/): SaltStack Salt Authentication Bypass (critical 9.8, exploited in the wild)
- [CVE-2020-7247](https://insights.sbomify.com/CVE-2020-7247/): OpenSMTPD Remote Code Execution (critical 9.8, exploited in the wild)
- [CVE-2019-16928](https://insights.sbomify.com/CVE-2019-16928/): Exim Out-of-bounds Write (critical 9.8, exploited in the wild)
- [CVE-2018-6789](https://insights.sbomify.com/CVE-2018-6789/): Exim Buffer Overflow (critical 9.8, exploited in the wild)
- [CVE-2015-2590](https://insights.sbomify.com/CVE-2015-2590/): Oracle Java SE and Java SE Embedded Remote Code Execution (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2019-19330 and fix it if it is affected.

What it is: CVE-2019-19330 is a critical vulnerability in Canonical Ubuntu Linux, published on 27 Nov 2019. 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-2019-19330 in the wild and no public exploit code.

Affected product: Canonical Ubuntu Linux. 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-2019-19330/ (Markdown: https://insights.sbomify.com/CVE-2019-19330/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2019-19330
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2019-19330
- OSV: https://osv.dev/vulnerability/CVE-2019-19330

---
From sbomify Insights: https://insights.sbomify.com/CVE-2019-19330/
Summaries are generated and may contain mistakes; the official description above is the record.