CVE-2021-28813Network attack vector

Credential disclosure via unrestricted sensitive-data storage

Published Sep 10, 2021 · Updated Sep 17, 2024

Credential exposure in QNAP QSW-M2116P-2T2S and affected QuNetSwitch builds allows remote attackers to read sensitive information. An unrestricted storage mechanism exposes stored credentials, but QNAP has not published the storage locus or request path that retrieves them. No authentication or user interaction is required; affected builds precede QSW-M2116P-2T2S 1.0.6 build 210713, QuNetSwitch 1.0.6.1509 on QGD-1600P and QGD-1602P, and 1.0.6.1519 on QGD-3014PT.

CVSS severity9.6
Critical
EPSS probability1.09%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Credential exposure in QNAP QSW-M2116P-2T2S and affected QuNetSwitch builds allows remote attackers to read sensitive information. An unrestricted storage mechanism exposes stored credentials, but QNAP has not published the storage locus or request path that retrieves them. No authentication or user interaction is required; affected builds precede QSW-M2116P-2T2S 1.0.6 build 210713, QuNetSwitch 1.0.6.1509 on QGD-1600P and QGD-1602P, and 1.0.6.1519 on QGD-3014PT.

The record

CVE
CVE-2021-28813
Published
Sep 10, 2021
Updated
Sep 17, 2024
Vendor
Linn Products Limited
Product
QSW-M2116P-2T2S
Classifications
CWE-798, CWE-259, CWE-922, CWE-522, T1552
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record 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=unspecified <1.0.6 build 210713

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QSW-M2116P-2T2Sversion=unspecified <1.0.6 build 210713
Linn Products Limited · QuNetSwitchversion=unspecified <1.0.6.1509; version=unspecified <1.0.6.1519

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
9.6QNAP Systems, Inc.CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
CWE-259Use of Hard-coded Password
CWE-922Insecure Storage of Sensitive Information
CWE-522Insufficiently Protected Credentials
T1552Unsecured Credentials

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo