What is the CVSS score of CVE-2025-48725?

CVE-2025-48725 has a CVSS 3.1 base score of 8.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H. EPSS exploitation probability: 0.1%.

How to fix or mitigate CVE-2025-48725?

Within 24 hours: Inventory all QNAP systems, identify affected versions, and restrict network access to administration interfaces. Within 7 days: Implement network segmentation to limit QNAP device access to trusted networks only, enforce strong password policies, and disable unnecessary remote access features. Within 30 days: Monitor QNAP security advisories for patch availability and develop a deployment plan; consider evaluating alternative storage solutions if patches remain unavailable.

Quts Hero CVE-2025-48725

HIGH

Classic Buffer Overflow (CWE-120)

2026-02-11 security@qnapsecurity.com.tw

Buffer Overflow Denial Of Service Qnap Qts Quts Hero

8.1

CVSS 3.1 · NVD

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Vulnerability Assessment

Weakness	CWE CWE-120 OWASP Top 10:2025 A06:2021 - Vulnerable and Outdated Components ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list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. Sign in to read
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 several QNAP operating system versions. 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 Qts. A buffer overflow vulnerability has been reported to affect several QNAP operating system versions. 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: QuTS hero h5.3.2.3354 build 20251225 and later

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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

We have already fixed the vulnerability in the following version: QuTS hero h5.3.2.3354 build 20251225 and later

Executive ViewAI

Why It Matters

A high-severity buffer overflow vulnerability (CVE-2025-48725) affects QNAP NAS systems and requires authenticated access to exploit, but could allow attackers to crash services or modify system memory. Organizations using QNAP devices should immediately identify affected systems and implement containment measures, as no vendor patch is currently available.

Business Impact: High

Compensating Controls

Restrict network access to QNAP devices via firewall rules; enforce strong authentication and multi-factor authentication for user accounts; segment QNAP devices on isolated VLANs; disable remote management protocols (SSH, HTTP/HTTPS) when not required; monitor for suspicious process crashes and memory modifications; implement endpoint detection and response (EDR) on systems with NAS access; regularly audit user account activity and remove unnecessary user accounts.

Threat Intelligence Overview

EPSS Score

0.1%

Top 71% exploitable

Data Quality

3 sources

Confidence: Low

NVD

CVE.org

EPSS

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

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +40

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

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 MEDIUM

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

Affected Products (CPE)CVE.org

cpe:2.3:o:qnap:qts:5.2.0.2737:build_20240417:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.0.2744:build_20240424:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.0.2782:build_20240601:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.0.2802:build_20240620:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.0.2823:build_20240711:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.0.2851:build_20240808:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.0.2860:build_20240817:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.1.2930:build_20241025:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.2.2950:build_20241114:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.3.3006:build_20250108:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.4.3070:build_20250312:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.4.3079:build_20250321:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.4.3092:build_20250403:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.5.3145:build_20250526:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.6.3195:build_20250715:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.6.3229:build_20250818:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.7.3256:build_20250913:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.7.3297:build_20251024:*:*:*:*:*:*

cpe:2.3:o:qnap:qts:5.2.8.3332:build_20251128:*:*:*:*:*:*

cpe:2.3:o:qnap:quts_hero:h5.2.0.2737:build_20240417:*:*:*:*:*:*

+ 17 more

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Same weakness CWE-120 – Classic Buffer Overflow

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References

Advisories & patches

ADVISORY https://www.qnap.com/en/security-advisory/qsa-26-08

Search Externally

GitHub PoC

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