CVE-2026-22900Network attack vector

Unauthenticated access via hard-coded credentials

Published Mar 20, 2026 · Updated Mar 20, 2026

Use of hard-coded credentials in QNAP QuNetSwitch before 2.0.5.0906 allows remote attackers to gain unauthorized access. QNAP has not published the affected account, credential, authentication path, or code locus that accepts the embedded secret. No authentication or user interaction is required; successful use exposes management access, while the vendor has not bounded the resulting privileges.

CVSS severity9.8
Critical
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of hard-coded credentials in QNAP QuNetSwitch before 2.0.5.0906 allows remote attackers to gain unauthorized access. QNAP has not published the affected account, credential, authentication path, or code locus that accepts the embedded secret. No authentication or user interaction is required; successful use exposes management access, while the vendor has not bounded the resulting privileges.

The record

CVE
CVE-2026-22900
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Linn Products Limited
Product
QuNetSwitch
Classifications
CWE-798, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 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=2.0.x <2.0.5.0906

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuNetSwitchversion=2.0.x <2.0.5.0906

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.8QNAP Systems, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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