# CVE-2024-34364: Envoy OOM vector from HTTP async client with unbounded response buffer for mirror response

> Attackers can cause denial of service in Envoy proxy by triggering out-of-memory conditions via unbounded buffering of mirrored HTTP responses.

- **Severity:** Medium 5.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** Yes
- **Published:** 4 Jun 2024
- **Updated:** 2 Aug 2024
- **Also known as:** BIT-envoy-2024-34364, GHSA-xcj3-h7vf-fw26

## What is CVE-2024-34364?

CVE-2024-34364 is a medium-severity denial of service vulnerability in Envoyproxy Envoy, published on 4 Jun 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Envoy is a cloud-native, open source edge and service proxy. Envoy exposed an out-of-memory (OOM) vector from the mirror response, since async HTTP client will buffer the response with an unbounded buffer.

Weakness: CWE-787 (Out-of-bounds Write), CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2024-34364?

1 open source package ship an affected version, including envoy. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `envoy` | Bitnami | All versions | 1.27.6, 1.28.4, 1.29.5, 1.30.2 |

Products: Envoyproxy Envoy.

## How do I fix CVE-2024-34364?

Upgrade envoy to a fixed version for your release line: 1.27.6, 1.28.4, 1.29.5 or 1.30.2.

## Is CVE-2024-34364 being exploited?

There is no known exploitation of CVE-2024-34364 in the wild and no public exploit code.

## Other vulnerabilities in Envoyproxy Envoy

- [CVE-2022-29226](https://insights.sbomify.com/CVE-2022-29226/): Trivial authentication bypass in Envoy (critical 10.0)
- [CVE-2019-18801](https://insights.sbomify.com/CVE-2019-18801/): Memory corruption in n/a (critical 9.8)
- [CVE-2019-18802](https://insights.sbomify.com/CVE-2019-18802/): Security feature bypass in n/a (critical 9.8)
- [CVE-2020-35470](https://insights.sbomify.com/CVE-2020-35470/): Information disclosure in n/a (high 8.8)
- [CVE-2024-23324](https://insights.sbomify.com/CVE-2024-23324/): Envoy ext auth can be bypassed when Proxy protocol filter sets invalid UTF-8 metadata (high 8.6)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2024-34364 and fix it if it is affected.

What it is: CVE-2024-34364 is a medium-severity denial of service vulnerability in Envoyproxy Envoy, published on 4 Jun 2024. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2024-34364 in the wild and no public exploit code.

Affected packages and fixed versions:
- envoy (Bitnami): affected all versions; fixed in 1.27.6, 1.28.4, 1.29.5, 1.30.2

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-2024-34364/ (Markdown: https://insights.sbomify.com/CVE-2024-34364/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2024-34364
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2024-34364
- OSV: https://osv.dev/vulnerability/CVE-2024-34364

---
From sbomify Insights: https://insights.sbomify.com/CVE-2024-34364/
Summaries are generated and may contain mistakes; the official description above is the record.