---
id: "CVE-2020-5847"
kind: "vulnerability"
aliases: ["CVE-2020-5847"]
title: "Unraid Unraid: Unraid Remote Code Execution Vulnerability"
severity: "critical"
cvss: 10.0
epss: 0.95844
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "Unraid Unraid", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "nas", "self-hosted", "unraid"]
not_affected_if: ["managed-hosting"]
published_at: "2020-03-16T18:15:12+00:00"
first_seen_at: "2026-10-23T19:11:53+00:00"
updated_at: "2026-10-23T20:29:29+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-5847", "first_seen_at": "2026-10-23T19:11:53+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-5847", "first_seen_at": "2026-10-23T19:13:43+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-5847", "first_seen_at": "2026-10-23T19:35:23+00:00"}]
---

# Unraid Unraid: Unraid Remote Code Execution Vulnerability

Unraid, a NAS and server OS, has an insecure use of PHP's extract function that lets a remote attacker run code as root. It is chainable with CVE-2020-5849 for initial access and is listed as exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Unraid Unraid affected ? fixed ?

## How to check

Check the installed Unraid version in the web UI under Tools > Update OS and compare it to the fixed release in the vendor advisory. unknown for the exact affected version range in the sources.

## Fix

Update Unraid to the fixed release per vendor instructions (CISA required action). Restrict the web UI to the LAN and do not expose it to the internet.

## Timeline

- 2026-10-23T19:11:53+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-5847
- 2026-10-23T19:13:43+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2020-5847
- 2026-10-23T19:35:23+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-5847

## From the sources

Unraid contains a vulnerability due to the insecure use of the extract PHP function that can be abused to execute remote code as root. This CVE is chainable with CVE-2020-5849 for initial access.

CISA required action: Apply updates per vendor instructions.

---

_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_