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CVE-2024-39948: CWE-476 NULL Pointer Dereference in Dahua NVR4XXX

0
High
VulnerabilityCVE-2024-39948cvecve-2024-39948cwe-476
Published: Wed Jul 31 2024 (07/31/2024, 03:40:29 UTC)
Source: CVE Database V5
Vendor/Project: Dahua
Product: NVR4XXX

Description

A vulnerability has been found in Dahua products. Attackers can send carefully crafted data packets to the interface with vulnerabilities, causing the device to crash.

AI-Powered Analysis

AILast updated: 10/04/2025, 10:25:34 UTC

Technical Analysis

CVE-2024-39948 is a high-severity vulnerability identified in Dahua NVR4XXX series network video recorders (NVRs), specifically affecting versions built before December 13, 2023. The vulnerability is classified under CWE-476 (NULL Pointer Dereference) and CWE-20 (Improper Input Validation). It arises when an attacker sends specially crafted data packets to a vulnerable interface on the device, triggering a NULL pointer dereference that causes the device to crash, leading to a denial of service (DoS) condition. The CVSS v3.1 base score is 7.5, reflecting a high severity level. The vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) indicates that the attack can be executed remotely over the network without any privileges or user interaction, and it impacts availability only, with no confidentiality or integrity loss. The vulnerability does not require authentication, making it accessible to unauthenticated attackers. Although no known exploits are currently reported in the wild, the ease of exploitation and the potential for service disruption make this a critical concern for organizations relying on Dahua NVR4XXX devices for video surveillance and security monitoring. The lack of available patches at the time of publication increases the urgency for mitigation measures.

Potential Impact

For European organizations, the impact of this vulnerability can be significant, especially for those in sectors relying heavily on video surveillance for security, such as critical infrastructure, transportation, retail, and public safety. A successful exploitation results in a denial of service, causing the affected NVR device to crash and become unavailable. This disrupts video recording and monitoring capabilities, potentially creating security blind spots and increasing the risk of undetected physical security incidents. In environments where continuous surveillance is mandated by regulatory or compliance requirements, such outages could lead to violations and legal consequences. Additionally, organizations may face operational downtime and increased costs due to device resets, manual intervention, or replacement. The vulnerability’s remote and unauthenticated exploitability heightens the risk of opportunistic attacks from external threat actors, including cybercriminals or hacktivists targeting European entities. Given the widespread use of Dahua products in Europe, the threat could affect a broad range of organizations, amplifying the potential for coordinated disruptions.

Mitigation Recommendations

1. Immediate mitigation should include network-level protections such as firewall rules to restrict access to the NVR management interfaces only to trusted internal IP addresses or VPN connections, effectively blocking unsolicited external traffic. 2. Implement network segmentation to isolate NVR devices from general corporate networks and the internet, reducing exposure to remote attacks. 3. Monitor network traffic for anomalous or malformed packets targeting NVR devices, using intrusion detection/prevention systems (IDS/IPS) with updated signatures or custom rules tailored to detect exploit attempts. 4. Regularly audit and inventory all Dahua NVR4XXX devices to identify affected versions and prioritize remediation. 5. Engage with Dahua or authorized vendors to obtain firmware updates or patches as soon as they become available, and apply them promptly. 6. If patches are not yet available, consider temporary device replacement or disabling vulnerable interfaces if feasible without impacting critical operations. 7. Maintain robust incident response plans that include procedures for rapid recovery from NVR outages to minimize operational impact. 8. Educate security and IT teams about this vulnerability to ensure awareness and readiness to respond to potential exploitation attempts.

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Technical Details

Data Version
5.1
Assigner Short Name
dahua
Date Reserved
2024-07-05T03:08:11.184Z
Cvss Version
3.1
State
PUBLISHED

Threat ID: 68e0f3c4b66c7f7acdd3ea36

Added to database: 10/4/2025, 10:15:32 AM

Last enriched: 10/4/2025, 10:25:34 AM

Last updated: 10/16/2025, 1:51:52 PM

Views: 16

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