CVE-2023-23371

Sensitive data disclosure via cleartext transmission

Published Oct 6, 2023 · Updated Sep 19, 2024

Cleartext transmission in QNAP QVPN Device Client for Windows 2.2.x allows local authenticated administrators to read sensitive data. QNAP has not published the affected component, the data transmitted without encryption, or the vector used to obtain it. Exploitation requires local administrator privileges, and the published record does not establish exposure beyond sensitive-data disclosure.

CVSS severity4.4
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cleartext transmission in QNAP QVPN Device Client for Windows 2.2.x allows local authenticated administrators to read sensitive data. QNAP has not published the affected component, the data transmitted without encryption, or the vector used to obtain it. Exploitation requires local administrator privileges, and the published record does not establish exposure beyond sensitive-data disclosure.

The record

CVE
CVE-2023-23371
Published
Oct 6, 2023
Updated
Sep 19, 2024
Vendor
Linn Products Limited
Product
QVPN Device Client
Classifications
CWE-311, CWE-319
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Oct 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 19, 2024Record 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=2.2.x <2.2.0.0823

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Linn Products Limited · QVPN Device Clientversion=2.2.x <2.2.0.0823

Published CVSS scores

4.4NISTCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
5.2QNAP Systems, Inc.CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-311Missing Encryption of Sensitive Data
CWE-319Cleartext Transmission of Sensitive Information

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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