CVE-2021-28812Network attack vector

Authenticated arbitrary command execution

Published Jun 3, 2021 · Updated Sep 16, 2024

OS command injection in QNAP Video Station before 5.5.4 allows remote authenticated users to execute arbitrary commands over the network. QNAP has not published the affected endpoint, input field, or operation that passes attacker-controlled data to a system command. Low-privileged authentication is required; successful exploitation executes commands with the Video Station service's privileges on the NAS.

CVSS severity8.8
High
EPSS probability1.55%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in QNAP Video Station before 5.5.4 allows remote authenticated users to execute arbitrary commands over the network. QNAP has not published the affected endpoint, input field, or operation that passes attacker-controlled data to a system command. Low-privileged authentication is required; successful exploitation executes commands with the Video Station service's privileges on the NAS.

The record

CVE
CVE-2021-28812
Published
Jun 3, 2021
Updated
Sep 16, 2024
Vendor
Linn Products Limited
Product
Video Station
Classifications
CWE-78, CWE-77, CWE-1286, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 3, 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

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 <5.5.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Linn Products Limited · Video Stationversion=unspecified <5.5.4

Published CVSS scores

6.5NIST NVDAV:N/AC:L/Au:S/C:P/I:P/A:P
8.8QNAP Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-1286Improper Validation of Syntactic Correctness of Input
T1059Command and Scripting Interpreter

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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