CVE-2025-52864Network attack vector

Authenticated memory modification or process crash

Published Jan 2, 2026 · Updated Jan 2, 2026

Buffer overflow in QNAP QTS 5.2.x and QuTS hero h5.2.x and h5.3.x allows remote authenticated users to modify memory or crash processes. QNAP has not disclosed the affected component, the input that reaches it, or the unchecked copy operation that overruns its destination buffer. A user account and network access are required; successful exploitation can corrupt process memory or terminate affected processes.

CVSS severity8.1
High
EPSS probability0.35%
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 and h5.3.x allows remote authenticated users to modify memory or crash processes. QNAP has not disclosed the affected component, the input that reaches it, or the unchecked copy operation that overruns its destination buffer. A user account and network access are required; successful exploitation can corrupt process memory or terminate affected processes.

The record

CVE
CVE-2025-52864
Published
Jan 2, 2026
Updated
Jan 2, 2026
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 2, 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=h5.2.x <h5.2.7.3256 build 20250913
  2. Affected versionversion=h5.3.x <h5.3.0.3192 build 20250716

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · QuTS heroversion=h5.2.x <h5.2.7.3256 build 20250913; version=h5.3.x <h5.3.0.3192 build 20250716
Linn Products Limited · QTSversion=5.2.x <5.2.7.3256 build 20250913

Published CVSS scores

1.3QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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-120Buffer Copy without Checking Size of Input ('Classic 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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