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Vulnerabilities

Vulnerability · CVE-2021-47707

COMMAX CVD-Axx DVR 5.1.4 contains weak default administrative credentials that allow remote password attacks and disclose RTSP stream.

Published Dec 9, 2025 · catalog updated Apr 7, 2026 · COMMAX Co., Ltd. COMMAX CVD-Axx DVR

Last checked Oct 27, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2021-47707. EPSS is 0.37%. Act only if a listed version of COMMAX Co., Ltd. COMMAX CVD-Axx DVR is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.37%
Remediation
Vendor / distro source
Affected products
vendor COMMAX Co., Ltd. COMMAX CVD-Axx DVR CVD-AH04 DVR 4.4.1

COMMAX CVD-Axx DVR 5.1.4 contains weak default administrative credentials that allow remote password attacks and disclose RTSP stream. Attackers can exploit this by sending a POST request with the 'passkey' parameter set to '1234', allowing them to access the web control panel.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor COMMAX Co., Ltd. COMMAX CVD-Axx DVR CVD-AH04 DVR 4.4.1CVD-AH04 DVR 4.4.1

How to fix CVE-2021-47707

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2021-47707. EPSS is 0.37%. Act only if a listed version of COMMAX Co., Ltd. COMMAX CVD-Axx DVR is installed.

Which versions are affected?

Compare what you have installed with COMMAX Co., Ltd. COMMAX CVD-Axx DVR CVD-AH04 DVR 4.4.1 CVD-AH04 DVR 4.4.1. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 9, 2025 · EUVD

    Detected

    COMMAX CVD-Axx DVR 5.1.4 contains weak default administrative credentials that allow remote password attacks and disclose RTSP stream. Attackers can exploit this by sending a POST request with the 'passkey' parameter set to '1234', allowing them to access the web control panel.

  2. Apr 7, 2026 · EUVD

    Updated

    COMMAX CVD-Axx DVR 5.1.4 contains weak default administrative credentials that allow remote password attacks and disclose RTSP stream. Attackers can exploit this by sending a POST request with the 'passkey' parameter set to '1234', allowing them to access the web control panel.

Sources

  • CVE.orgVulnerability recordCVE-2021-47707

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2021-47707

    30-day exploitation probability 0.37%

    first.org
  • EUVDVulnerability recordEUVD-2021-34732

    COMMAX CVD-Axx DVR 5.1.4 contains weak default administrative credentials that allow remote password attacks and disclose RTSP stream. Attackers can exploit this by sending a POST request with the 'passkey' parameter set to '1234', allowing them to access the web control panel.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 27, 2026
  • FIRST EPSSOct 26, 2026
  • EUVDOct 26, 2026