CVE-2025-30265Network attack vector

Authenticated process crashes via buffer overflow

Published Aug 29, 2025 · Updated Aug 29, 2025

Buffer overflow in QNAP QTS 5.2.x and QuTS hero h5.2.x allows remote authenticated users to modify memory or crash processes. QNAP has not disclosed the affected component, input, or copy operation that exceeds its destination buffer. A valid user account and an additional attack condition are required, and the reported consequence is limited to process interruption.

CVSS severity2.3
Low
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in QNAP QTS 5.2.x and QuTS hero h5.2.x allows remote authenticated users to modify memory or crash processes. QNAP has not disclosed the affected component, input, or copy operation that exceeds its destination buffer. A valid user account and an additional attack condition are required, and the reported consequence is limited to process interruption.

The record

CVE
CVE-2025-30265
Published
Aug 29, 2025
Updated
Aug 29, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-121, CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 29, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 29, 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 <h5.2.5.3138 build 20250519

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=h5.2.x <h5.2.5.3138 build 20250519
Linn Products Limited · QTSversion=5.2.x <5.2.5.3145 build 20250526

Published CVSS scores

6.5National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.3QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:P/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
CWE-120Classic Buffer Overflow
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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