# CVE-2023-3665: Code injection in Trellix Endpoint Security

> A local attacker can inject code via environment variables to disable AMSI, leading to arbitrary code execution or denial of service in Trellix ENS.

- **Severity:** Medium 5.5 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 4 Oct 2023
- **Updated:** 19 Sep 2024
- **Also known as:** GHSA-55hp-w727-hgmp

## What is CVE-2023-3665?

CVE-2023-3665 is a medium-severity code injection vulnerability in Trellix Endpoint Security, published on 4 Oct 2023. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A code injection vulnerability in Trellix ENS 10.7.0 April 2023 release and earlier, allowed a local user to disable the ENS AMSI component via environment variables,
leading to denial of service and or the execution of arbitrary code.

Weakness: CWE-94 (Improper Control of Generation of Code), CWE-74 (Improper Neutralization of Special Elements in Output Used by a Downstream Component)

## Which versions are affected by CVE-2023-3665?

It affects 1 product.


Products: Trellix Endpoint Security.

## How do I fix CVE-2023-3665?

No fix has been published for CVE-2023-3665 yet. Limit exposure of the affected software until one is available.

## Is CVE-2023-3665 being exploited?

There is no known exploitation of CVE-2023-3665 in the wild and no public exploit code.

## Other vulnerabilities in Trellix Endpoint Security

- [CVE-2025-14963](https://insights.sbomify.com/CVE-2025-14963/): Privilege escalation in Endpoint HX Agent (xAgent) (medium 6.2)
- [CVE-2022-4326](https://insights.sbomify.com/CVE-2022-4326/): Trellix xAgent permission bypass vulnerability (medium 5.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-3665 and fix it if it is affected.

What it is: CVE-2023-3665 is a medium-severity code injection vulnerability in Trellix Endpoint Security, published on 4 Oct 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-3665 in the wild and no public exploit code.

Affected product: Trellix Endpoint Security. 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-2023-3665/ (Markdown: https://insights.sbomify.com/CVE-2023-3665/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-3665
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-3665
- OSV: https://osv.dev/vulnerability/CVE-2023-3665

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-3665/
Summaries are generated and may contain mistakes; the official description above is the record.