CVE-2025-54163Network attack vector

Administrator-authenticated service interruption via NULL dereference

Published Feb 11, 2026 · Updated Feb 11, 2026

NULL pointer dereference in QNAP File Station 5 before 5.5.6.5166 allows remote authenticated users to interrupt the service. QNAP has not disclosed the affected function, request field, or operation that lets crafted input reach the null dereference. An administrator account is required; exploitation causes a denial of service, with no reported confidentiality or integrity impact.

CVSS severity4.9
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in QNAP File Station 5 before 5.5.6.5166 allows remote authenticated users to interrupt the service. QNAP has not disclosed the affected function, request field, or operation that lets crafted input reach the null dereference. An administrator account is required; exploitation causes a denial of service, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2025-54163
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Linn Products Limited
Product
File Station 5
Classifications
CWE-476, CAPEC-129, T1499
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.5.x <5.5.6.5166

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · File Station 5version=5.5.x <5.5.6.5166

Published CVSS scores

4.9NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
1.2QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
CAPEC-129Pointer Manipulation
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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