# CVE-2021-47739: Epic Games Easy Anti-Cheat 4.0 Local Privilege Escalation via Unquoted Service Path

> Local attackers can execute arbitrary code with system privileges by exploiting an unquoted service path in Epic Games Easy Anti-Cheat.

- **Severity:** High 8.5 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA: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:** 23 Dec 2025
- **Updated:** 23 Dec 2025
- **Also known as:** GHSA-r6ff-6pwf-xvp7

## What is CVE-2021-47739?

CVE-2021-47739 is a high-severity vulnerability in Epic Games Easy Anti-Cheat, published on 23 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

Epic Games Easy Anti-Cheat 4.0 contains an unquoted service path vulnerability that allows local non-privileged users to execute arbitrary code with elevated system privileges. Attackers can exploit the service configuration by inserting malicious code in the system root path that would execute with LocalSystem privileges during application startup.

Weakness: CWE-428 (Unquoted Search Path or Element)

## Which versions are affected by CVE-2021-47739?


## How do I fix CVE-2021-47739?

No fix has been published for CVE-2021-47739 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-47739 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47739 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47739 and fix it if it is affected.

What it is: CVE-2021-47739 is a high-severity vulnerability in Epic Games Easy Anti-Cheat, published on 23 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-47739 exists.

Affected product: Epic Games Easy Anti-Cheat. 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-2021-47739/ (Markdown: https://insights.sbomify.com/CVE-2021-47739/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47739
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47739
- OSV: https://osv.dev/vulnerability/CVE-2021-47739

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47739/
Summaries are generated and may contain mistakes; the official description above is the record.