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Qsync Central CVE-2025-48724

HIGH
Classic Buffer Overflow (CWE-120)
2026-02-11 security@qnapsecurity.com.tw
8.1
CVSS 3.1 · NVD
View

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Buffer copy size validation
MITRE ATT&CK

1 technique across 1 tactic: Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Impact

CVSS 8.1 (HIGH). Attack vector: Network. Complexity: Low. Privileges required: Low. User interaction: None. Exploitable via remote/network.

Exploit ScenarioDerived

A remote attacker could exploit this vulnerability to compromise the affected system.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
No patch listed yet 0.1% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

A buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes. [CVSS 8.1 HIGH]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Classified as CWE-120 (Classic Buffer Overflow). Affects Qsync Central. A buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes.

We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

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  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 8.1 HIGH
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

DescriptionCVE.org

A buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, they can then exploit the vulnerability to modify memory or crash processes.

We have already fixed the vulnerability in the following version: Qsync Central 5.0.0.4 ( 2026/01/20 ) and later

Executive ViewAI

Why It Matters

CVE-2025-48724 is a HIGH severity buffer overflow in Qsync Central that allows authenticated attackers to crash services or modify system memory, potentially leading to data corruption or unauthorized access. Organizations using Qsync Central are at immediate risk since no patch is currently available, and the vulnerability requires only valid user credentials to exploit.

Business Impact: High
Compensating Controls

Restrict network access to Qsync Central via firewall rules and network segmentation; enforce strong authentication with multi-factor authentication; disable Qsync Central service if not operationally critical; implement enhanced logging and monitoring for authentication attempts and process crashes; conduct regular access reviews to minimize valid user accounts; consider temporary relocation of sensitive workflows to alternative systems until patch availability is confirmed.

Threat Intelligence Overview

EPSS Score
0.1%
Top 71% exploitable
Data Quality
3 sources
Confidence: Low

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.1%
Patch available No
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
High

Priority Score

40
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +40
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)CVE.org

cpe:2.3:a:qnap:qsync_central:*:*:*:*:*:*:*:*
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SQL injection vulnerability in Qsync Central that allows authenticated remote attackers to execute arbitrary code or com

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SQL injection in QNAP Qsync Central 5.0.0 (all builds prior to 5.0.0.2) allows a remote attacker who already holds a val

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SQL injection in QNAP Qsync Central versions 5.0.0 through below 5.0.0.2 lets a remote attacker who already holds a vali

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A buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, th

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A use of externally-controlled format string vulnerability has been reported to affect Qsync Central. If a remote attack

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A buffer overflow vulnerability has been reported to affect Qsync Central. If a remote attacker gains a user account, th

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