CVE-2023-7227Public exploitNetwork attack vector

Root command execution via DDNS hostname injection

Published Jan 25, 2024 · Updated May 29, 2025

Command injection in SystemK NVR 504, 508, and 516 2.3.5SK.30084998 and earlier allows remote attackers to execute root commands via DDNS settings. The ddnsserver.cgi test action places an attacker-controlled hostname into a shell command without neutralizing shell metacharacters. The published request targets the network-reachable DDNS test action without user interaction, and successful exploitation grants full appliance control.

CVSS severity9.8
Critical
EPSS probability1.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Command injection in SystemK NVR 504, 508, and 516 2.3.5SK.30084998 and earlier allows remote attackers to execute root commands via DDNS settings. The ddnsserver.cgi test action places an attacker-controlled hostname into a shell command without neutralizing shell metacharacters. The published request targets the network-reachable DDNS test action without user interaction, and successful exploitation grants full appliance control.

The record

CVE
CVE-2023-7227
Published
Jan 25, 2024
Updated
May 29, 2025
Vendor
SystemK Corporation
Product
NVR 516
Classifications
CWE-77, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 25, 2024CVE publishedPublication date reported by the CVE source.
  2. May 29, 2025Record 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=2.3.5SK.30084998

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SystemK Corporation · NVR 516version=2.3.5SK.30084998
SystemK Corporation · NVR 504version=2.3.5SK.30084998
SystemK Corporation · NVR 508version=2.3.5SK.30084998

Published CVSS scores

9.8CISACVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

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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