CVE-2024-39949Network attack vector

Unauthenticated device crash via crafted packets

Published Jul 31, 2024 · Updated Sep 30, 2025

Denial of service in Dahua NVR4XXX firmware built before 2023/12/13 allows remote attackers to crash the recorder via crafted packets. Dahua identifies a vulnerable network interface but has not published the affected protocol, endpoint, parser, or invalid operation. No authentication or user interaction is required; the documented consequence is a device crash, with no reported confidentiality or integrity impact.

CVSS severity7.5
High
EPSS probability0.56%
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 2023/12/13 allows remote attackers to crash the recorder via crafted packets. Dahua identifies a vulnerable network interface but has not published the affected protocol, endpoint, parser, or invalid operation. No authentication or user interaction is required; the documented consequence is a device crash, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2024-39949
Published
Jul 31, 2024
Updated
Sep 30, 2025
Vendor
Zhejiang Dahua Technology Co., Ltd.
Product
Dahua NVR4XXX Firmware
Classifications
CWE-617, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 31, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 30, 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=0 <2023.12.13

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zhejiang Dahua Technology Co., Ltd. · Dahua NVR4XXX Firmwareversion=0 <2023.12.13
Zhejiang Dahua Technology Co., Ltd. · NVR4XXXversion=NVR4XXX Versions which Build time before 2023/12/13

Published CVSS scores

7.5Zhejiang Dahua Technology Co., Ltd.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.7Zhejiang Dahua Technology Co., Ltd.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-617Reachable Assertion
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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