CVE-2024-39947Network attack vector

Authenticated device crash

Published Jul 31, 2024 · Updated Oct 27, 2024

Denial of service in Dahua NVR4XXX firmware built before December 13, 2023 allows remote authenticated users to crash the device. Dahua identifies only a crafted packet sent to an affected interface and has not disclosed the interface, parser, or invalid operation that triggers the crash. Ordinary user credentials are required, and successful exploitation interrupts the recorder without reported data disclosure or modification.

CVSS severity6.5
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Dahua NVR4XXX firmware built before December 13, 2023 allows remote authenticated users to crash the device. Dahua identifies only a crafted packet sent to an affected interface and has not disclosed the interface, parser, or invalid operation that triggers the crash. Ordinary user credentials are required, and successful exploitation interrupts the recorder without reported data disclosure or modification.

The record

CVE
CVE-2024-39947
Published
Jul 31, 2024
Updated
Oct 27, 2024
Vendor
Zhejiang Dahua Technology Co., Ltd.
Product
NVR4XXX
Classifications
T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 27, 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=NVR4XXX Versions which Build time before 2023/12/13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zhejiang Dahua Technology Co., Ltd. · NVR4XXXversion=NVR4XXX Versions which Build time before 2023/12/13

Published CVSS scores

5.9Zhejiang Dahua Technology Co., Ltd.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
6.5Zhejiang Dahua Technology Co., Ltd.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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

T1499.004Application or System Exploitation

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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