CVE-2025-58466Network attack vector

Service interruption via uninitialized variable use

Published Feb 11, 2026 · Updated Feb 11, 2026

Use of an uninitialized variable in QNAP QTS 5.2.x and QuTS hero h5.2.x allows remote authenticated users to interrupt service. QNAP has not disclosed the affected component or the operation that consumes the uninitialized variable, but reports denial of service or unexpected control-flow changes. Exploitation requires an administrator account; published impact metrics limit the demonstrated consequence to availability loss, with no reported data disclosure or modification.

CVSS severity5.1
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

Use of an uninitialized variable in QNAP QTS 5.2.x and QuTS hero h5.2.x allows remote authenticated users to interrupt service. QNAP has not disclosed the affected component or the operation that consumes the uninitialized variable, but reports denial of service or unexpected control-flow changes. Exploitation requires an administrator account; published impact metrics limit the demonstrated consequence to availability loss, with no reported data disclosure or modification.

The record

CVE
CVE-2025-58466
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-457, CAPEC-77, 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=h5.2.x <h5.2.8.3321 build 20251117

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · QuTS heroversion=h5.2.x <h5.2.8.3321 build 20251117
Linn Products Limited · QTSversion=5.2.x <5.2.8.3332 build 20251128

Published CVSS scores

5.1QNAP 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
4.9National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-457Use of Uninitialized Variable
CAPEC-77Manipulating User-Controlled Variables
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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