CVE-2025-48726Network attack vector

Administrator-gated denial of service via NULL dereference

Published Oct 3, 2025 · Updated Oct 3, 2025

NULL pointer dereference in QNAP QTS 5.2.x and QuTS hero h5.2.x allows remote authenticated users to cause a denial of service. QNAP has not disclosed the affected component, request path, or operation that dereferences the NULL pointer. Reachability requires an administrator account; QNAP does not identify whether the device or a component crashes, hangs, or restarts.

CVSS severity5.1
Medium
EPSS probability0.47%
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 QTS 5.2.x and QuTS hero h5.2.x allows remote authenticated users to cause a denial of service. QNAP has not disclosed the affected component, request path, or operation that dereferences the NULL pointer. Reachability requires an administrator account; QNAP does not identify whether the device or a component crashes, hangs, or restarts.

The record

CVE
CVE-2025-48726
Published
Oct 3, 2025
Updated
Oct 3, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-476, T1499.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 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=h5.2.x <h5.2.6.3195 build 20250715

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · QuTS heroversion=h5.2.x <h5.2.6.3195 build 20250715
Linn Products Limited · QTSversion=5.2.x <5.2.6.3195 build 20250715

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

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
T1499.004Application or System Exploitation

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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