CVE-2024-39948Network attack vector

Unauthenticated device crash via crafted network packets

Published Jul 31, 2024 · Updated Sep 30, 2025

NULL pointer dereference in Dahua NVR4XXX builds before 2023.12.13 allows remote attackers to crash the device with crafted packets. The affected network interface mishandles malformed packet data and dereferences a NULL pointer, although Dahua has not identified the interface or code path. No credentials or user interaction are required, and the documented consequence is a device crash without reported data disclosure or modification.

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

NULL pointer dereference in Dahua NVR4XXX builds before 2023.12.13 allows remote attackers to crash the device with crafted packets. The affected network interface mishandles malformed packet data and dereferences a NULL pointer, although Dahua has not identified the interface or code path. No credentials or user interaction are required, and the documented consequence is a device crash without reported data disclosure or modification.

The record

CVE
CVE-2024-39948
Published
Jul 31, 2024
Updated
Sep 30, 2025
Vendor
Zhejiang Dahua Technology Co., Ltd.
Product
NVR4832-I
Classifications
CWE-20, CWE-476, 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. · NVR4832-Iversion=0 <2023.12.13
Zhejiang Dahua Technology Co., Ltd. · NVR4XXXversion=NVR4XXX Versions which Build time before 2023/12/13

Published CVSS scores

7.5DahuaCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.7DahuaCVSS: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-20Improper Input Validation
CWE-476NULL Pointer Dereference
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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