CVE-2025-59385Network attack vector

Unauthenticated resource access via spoofed identity

Published Dec 16, 2025 · Updated Dec 16, 2025

Authentication bypass by spoofing in QNAP QTS and QuTS hero allows remote attackers to access protected resources without credentials. QNAP has not disclosed the affected component, the trusted identifier being spoofed, or the validation error that accepts it. The flaw is network-reachable without privileges or user interaction, and successful exploitation bypasses access controls to protected NAS resources.

CVSS severity9.8
Critical
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass by spoofing in QNAP QTS and QuTS hero allows remote attackers to access protected resources without credentials. QNAP has not disclosed the affected component, the trusted identifier being spoofed, or the validation error that accepts it. The flaw is network-reachable without privileges or user interaction, and successful exploitation bypasses access controls to protected NAS resources.

The record

CVE
CVE-2025-59385
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-290, CAPEC-21, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=h5.2.x <h5.2.7.3297 build 20251024
  2. Affected versionversion=h5.3.x <h5.3.1.3292 build 20251024

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=h5.2.x <h5.2.7.3297 build 20251024; version=h5.3.x <h5.3.1.3292 build 20251024
Linn Products Limited · QTSversion=5.2.x <5.2.7.3297 build 20251024

Published CVSS scores

8.1QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
CAPEC-21Exploitation of Trusted Identifiers
T1190Exploit Public-Facing Application

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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