CVE-2021-28810Known exploitationNetwork attack vector

Unauthenticated access to protected resources

Published Jun 8, 2021 · Updated Sep 16, 2024

Authentication bypass in Roon Server before 2021-05-18 allows remote attackers to access protected resources over the network. The flaw is located in the QNAP app's web interface, but published material does not identify the spoofed identity data or failed authentication check. No credentials or user interaction are required, and the documented consequence is limited to unauthorized resource access.

CVSS severity7.5
High
EPSS probability1.03%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Roon Server before 2021-05-18 allows remote attackers to access protected resources over the network. The flaw is located in the QNAP app's web interface, but published material does not identify the spoofed identity data or failed authentication check. No credentials or user interaction are required, and the documented consequence is limited to unauthorized resource access.

The record

CVE
CVE-2021-28810
Published
Jun 8, 2021
Updated
Sep 16, 2024
Vendor
Roon Labs
Product
Roon Server
Classifications
CWE-290, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 8, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=unspecified <2021-05-18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Roon Labs · Roon Serverversion=unspecified <2021-05-18

Published CVSS scores

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

Weakness, pattern, technique

CWE-290Authentication Bypass by Spoofing
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Reported exploitation

Technologies

Your stack

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Your stack

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