CVE-2025-30269Network attack vector

Secret disclosure and memory modification via format string

Published Feb 11, 2026 · Updated Feb 11, 2026

Externally controlled format strings in QNAP Qsync Central 5.0.x allow remote authenticated users to disclose secrets or modify memory. QNAP has not disclosed the affected function or how attacker-controlled text reaches a formatting operation. A valid user account and an undisclosed additional attack condition are required, and no code-execution consequence has been reported.

CVSS severity8.1
High
EPSS probability0.29%
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 Qsync Central 5.0.x allow remote authenticated users to disclose secrets or modify memory. QNAP has not disclosed the affected function or how attacker-controlled text reaches a formatting operation. A valid user account and an undisclosed additional attack condition are required, and no code-execution consequence has been reported.

The record

CVE
CVE-2025-30269
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Linn Products Limited
Product
Qsync Central
Classifications
CWE-134
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 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=5.0.x.x <5.0.0.4 ( 2026/01/20 )

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · Qsync Centralversion=5.0.x.x <5.0.0.4 ( 2026/01/20 )

Published CVSS scores

0.6QNAP 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/E:U
8.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-134Use of Externally-Controlled Format String

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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