CVE-2025-62852Network attack vector

Memory modification and process crashes via buffer overflow

Published Jan 2, 2026 · Updated Jan 2, 2026

Stack-based buffer overflow in QNAP QTS 5.2.x allows remote authenticated users with administrator access to modify memory or crash processes. QNAP has not disclosed the affected component, input, or operation that overruns the stack buffer. Exploitation requires a QTS administrator account over the network and can corrupt process memory or terminate affected processes.

CVSS severity6.5
Medium
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

Stack-based buffer overflow in QNAP QTS 5.2.x allows remote authenticated users with administrator access to modify memory or crash processes. QNAP has not disclosed the affected component, input, or operation that overruns the stack buffer. Exploitation requires a QTS administrator account over the network and can corrupt process memory or terminate affected processes.

The record

CVE
CVE-2025-62852
Published
Jan 2, 2026
Updated
Jan 2, 2026
Vendor
Linn Products Limited
Product
QTS
Classifications
CWE-787, CWE-121, T1499.004
Attack vector
network
Privileges
admin

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=5.2.x <5.2.8.3332 build 20251128

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · QTSversion=5.2.x <5.2.8.3332 build 20251128

Published CVSS scores

6.5National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
1.2QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:L/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
CWE-121Stack-based 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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