CVE-2025-48722Network attack vector

Authenticated service interruption via NULL pointer dereference

Published Feb 11, 2026 · Updated Feb 11, 2026

NULL pointer dereference in QNAP Qsync Central before 5.0.0.4 allows remote authenticated users to interrupt the service. QNAP has not disclosed the affected function, the request field that reaches it, or why attacker-controlled input becomes a NULL pointer. A valid user account and network access are required; exploitation affects availability by crashing or otherwise interrupting Qsync Central, with no reported data exposure or modification.

CVSS severity6.5
Medium
EPSS probability0.41%
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 Qsync Central before 5.0.0.4 allows remote authenticated users to interrupt the service. QNAP has not disclosed the affected function, the request field that reaches it, or why attacker-controlled input becomes a NULL pointer. A valid user account and network access are required; exploitation affects availability by crashing or otherwise interrupting Qsync Central, with no reported data exposure or modification.

The record

CVE
CVE-2025-48722
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Linn Products Limited
Product
Qsync Central
Classifications
CWE-476, CAPEC-129, T1499
Attack vector
network
Privileges
authenticated

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=5.0.x.x <5.0.0.4 ( 2026/01/20 )

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · Qsync Centralversion=5.0.x.x <5.0.0.4 ( 2026/01/20 )

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1.3QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/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
Privilegesauthenticated
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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