---
id: "CVE-2020-2509"
kind: "vulnerability"
aliases: ["CVE-2020-2509"]
title: "QNAP QNAP Network-Attached Storage (NAS): QNAP Network-Attached Storage (NAS) Command Injection Vulnerability"
severity: "critical"
cvss: 9.8
epss: 0.33987
exploited: true
status: "open"
category: "infrastructure"
products: [{"name": "QNAP QNAP Network-Attached Storage (NAS)", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "infrastructure", "nas", "qnap", "self-hosted"]
not_affected_if: ["non-qnap-hardware"]
published_at: "2021-04-17T04:15:11+00:00"
first_seen_at: "2026-10-23T19:11:52+00:00"
updated_at: "2026-10-23T21:57:35+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-2509", "first_seen_at": "2026-10-23T19:11:52+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2020-2509", "first_seen_at": "2026-10-23T19:13:44+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-2509", "first_seen_at": "2026-10-23T21:57:35+00:00"}]
---

# QNAP QNAP Network-Attached Storage (NAS): QNAP Network-Attached Storage (NAS) Command Injection Vulnerability

QNAP NAS devices contain a command injection flaw that lets an attacker run commands on the device. The sources describe it as remote code execution and say it is actively exploited in the wild.

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

## Affected

- vendor:QNAP QNAP Network-Attached Storage (NAS) affected ? fixed ?

## Fix

Apply the QNAP firmware update per vendor instructions, as CISA requires; the fixed version is unknown from the sources.

## Timeline

- 2026-10-23T19:11:52+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2020-2509
- 2026-10-23T19:13:44+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2020-2509
- 2026-10-23T21:57:35+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2020-2509

## From the sources

A command injection vulnerability has been reported to affect QTS and QuTS hero. If exploited, this vulnerability allows attackers to execute arbitrary commands in a compromised application. We have already fixed this vulnerability in the following versions: QTS 4.5.2.1566 Build 20210202 and later QTS 4.5.1.1495 Build 20201123 and later QTS 4.3.6.1620 Build 20210322 and later QTS 4.3.4.1632 Build 20210324 and later QTS 4.3.3.1624 Build 20210416 and later QTS 4.2.6 Build 20210327 and later QuTS hero h4.5.1.1491 build 20201119 and later

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