CVE-2026-22899

Analyzed Analyzed - Analysis Complete

NULL Pointer Dereference in QNAP File Station DoS Vulnerability

Publication date: 2026-06-10

Last updated on: 2026-06-12

Assigner: QNAP Systems, Inc.

Description

A NULL pointer dereference vulnerability has been reported to affect File Station 6. If a remote attacker gains a user account, they can then exploit the vulnerability to launch a denial-of-service (DoS) attack. We have already fixed the vulnerability in the following version: File Station 5 5.5.6.5208 and later

CVSS Scores

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Meta Information

Published

2026-06-10

Last Modified

2026-06-12

Generated

2026-06-30

AI Q&A

2026-06-10

EPSS Evaluated

2026-06-29

NVD

CVE-2026-22899

EUVD

EUVD-2026-35973

Affected Vendors & Products

Vendor	Product	Version / Range
qnap	file_station	From 5.5.6.4691 (inc) to 5.5.6.5208 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-476	The product dereferences a pointer that it expects to be valid but is NULL.

Attack-Flow Graph

Executive Summary

This vulnerability is a NULL pointer dereference issue affecting File Station 6. It allows a remote attacker who has gained a user account to exploit the flaw and cause a denial-of-service (DoS) attack.

Impact Analysis

If exploited, this vulnerability can cause a denial-of-service (DoS) condition, potentially disrupting the availability of the affected File Station service.

Mitigation Strategies

To mitigate this vulnerability, you should upgrade File Station to version 5.5.6.5208 or later, where the issue has been fixed.

Additionally, since exploitation requires a remote attacker to have a user account, reviewing and restricting user account access can help reduce risk.

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