Threats / QNAP / CVE-2020-2509
CVE-2020-2509
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
QNAP Network-Attached Storage (NAS) vulnerability
QNAP NAS devices are vulnerable to command injection attacks that enable remote code execution. The vulnerability has been actively exploited in the wild.
Verdict
Today item — known-exploited.
Unauthenticated or low-privileged attackers can inject arbitrary commands through QNAP NAS interfaces, achieving remote code execution. Active exploitation and high EPSS score indicate immediate risk to exposed devices.
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
5 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-04-11).
Probability (EPSS)
EPSS 0.34168 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: QNAP, QNAP Network-Attached Storage (NAS). Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-77 Command Injection, CWE-78 OS Command Injection — weakness family: Injection.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I identify a QNAP NAS device exposed on the network or internet.
Business
Inventory and asset visibility gaps leave NAS appliances discoverable by threat actors.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I craft a malicious input containing shell metacharacters to bypass input validation and inject commands.
Business
Insufficient input sanitization in QNAP firmware creates exploitable attack surface.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute arbitrary commands with the privileges of the NAS application process.
Business
Compromised NAS becomes a pivot point for lateral movement and data exfiltration within trusted infrastructure.
4
Data at risk — exfiltration narrative 4
Attacker
I establish persistence and maintain access to stored data and connected systems.
Business
Loss of confidentiality, integrity, and availability of business-critical files and backups.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by qnapCNA
Credited with finding itOmri Mallis, Yaniv Puyeskiunspecified