CVE-2024-53694

Unauthorized resource access via undisclosed TOCTOU race

Published Mar 7, 2025 · Updated Mar 7, 2025

TOCTOU races in QNAP QVPN Device Client, Qsync, and Qfinder Pro for Mac allow local users to access unauthorized resources. QNAP has not disclosed the checked resource, intervening state change, or operation that consumes the stale result. Exploitation requires local user access and active user interaction; the available records do not identify whether the resulting access permits reading, writing, or executing content.

CVSS severity8.6
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

TOCTOU races in QNAP QVPN Device Client, Qsync, and Qfinder Pro for Mac allow local users to access unauthorized resources. QNAP has not disclosed the checked resource, intervening state change, or operation that consumes the stale result. Exploitation requires local user access and active user interaction; the available records do not identify whether the resulting access permits reading, writing, or executing content.

The record

CVE
CVE-2024-53694
Published
Mar 7, 2025
Updated
Mar 7, 2025
Vendor
Linn Products Limited
Product
Qsync
Classifications
CWE-367, CAPEC-29, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.1.x <5.1.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Linn Products Limited · Qsyncversion=5.1.x <5.1.3
Linn Products Limited · Qfinder Proversion=7.11.x <7.11.1
Linn Products Limited · QVPN Device Clientversion=2.2.x <2.2.5

Published CVSS scores

8.6QNAP Systems, Inc.CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
CAPEC-29Leveraging Time-of-Check and Time-of-Use (TOCTOU) Race Conditions
T1068Exploitation for Privilege Escalation

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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