CVE-2021-47709Public exploitNetwork attack vector

Configuration overwrite and service interruption via setconf

Published Dec 9, 2025 · Updated Apr 7, 2026

Missing authentication in COMMAX Smart Home Ruvie CCTV Bridge DVR Service allows remote attackers to alter DVR configuration. The GoAhead-Webs /goform/setconf endpoint accepts unauthenticated form data for manufacturer, channel, and RTSP DVR arguments, applies the supplied configuration, and schedules a restart. Network access to TCP port 8086 is sufficient; a malformed configuration can leave the service refusing connections, causing a service interruption.

CVSS severity8.7
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in COMMAX Smart Home Ruvie CCTV Bridge DVR Service allows remote attackers to alter DVR configuration. The GoAhead-Webs /goform/setconf endpoint accepts unauthenticated form data for manufacturer, channel, and RTSP DVR arguments, applies the supplied configuration, and schedules a restart. Network access to TCP port 8086 is sufficient; a malformed configuration can leave the service refusing connections, causing a service interruption.

The record

CVE
CVE-2021-47709
Published
Dec 9, 2025
Updated
Apr 7, 2026
Vendor
COMMAX
Product
Smart Home Ruvie CCTV Bridge DVR Service
Classifications
CWE-306, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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?

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  1. Affected versionversion=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

COMMAX · Smart Home Ruvie CCTV Bridge DVR Serviceversion=*

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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 exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1499Endpoint Denial of Service

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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