CVE-2025-53407Network attack vector

Administrator-level secret disclosure and memory modification

Published Oct 3, 2025 · Updated Oct 3, 2025

Externally controlled format strings in QNAP QTS 5.2.x and QuTS hero h5.2.x allow remote authenticated users to expose secrets or modify memory. QNAP has not disclosed the affected component or the operation that accepts attacker-controlled text as a format string. Exploitation requires an administrator account; the published record bounds the consequence to secret-data exposure or memory modification.

CVSS severity5.1
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Externally controlled format strings in QNAP QTS 5.2.x and QuTS hero h5.2.x allow remote authenticated users to expose secrets or modify memory. QNAP has not disclosed the affected component or the operation that accepts attacker-controlled text as a format string. Exploitation requires an administrator account; the published record bounds the consequence to secret-data exposure or memory modification.

The record

CVE
CVE-2025-53407
Published
Oct 3, 2025
Updated
Oct 3, 2025
Vendor
Linn Products Limited
Product
QuTS hero
Classifications
CWE-134, CAPEC-135
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Oct 3, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 3, 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 <h5.2.6.3195 build 20250715

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Linn Products Limited · QuTS heroversion=h5.2.x <h5.2.6.3195 build 20250715
Linn Products Limited · QTSversion=5.2.x <5.2.6.3195 build 20250715

Published CVSS scores

5.1QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A: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 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-134Use of Externally-Controlled Format String
CAPEC-135Format String Injection

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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