CVE-2025-30279Network attack vector

Authenticated service interruption via improper certificate validation

Published Jun 6, 2025 · Updated Jun 6, 2025

Improper certificate validation in QNAP File Station 5 before 5.5.6.4847 allows remote authenticated users to disrupt NAS services. QNAP has not published which certificate-processing path accepts an untrusted certificate or which validation check is missing. A valid user account and network access are required; the vendor assessment bounds the reported consequence to service interruption.

CVSS severity8.3
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in QNAP File Station 5 before 5.5.6.4847 allows remote authenticated users to disrupt NAS services. QNAP has not published which certificate-processing path accepts an untrusted certificate or which validation check is missing. A valid user account and network access are required; the vendor assessment bounds the reported consequence to service interruption.

The record

CVE
CVE-2025-30279
Published
Jun 6, 2025
Updated
Jun 6, 2025
Vendor
Linn Products Limited
Product
File Station 5
Classifications
CWE-295, CAPEC-475
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 6, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 6, 2025Record 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 <5.5.6.4847

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · File Station 5version=5.5.x <5.5.6.4847

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.3QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
CAPEC-475Signature Spoofing by Improper Validation

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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