Vulnerability Monitor

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CVE-2023-6397

A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1 could allow a LAN-based attacker to cause denial-of-service (DoS) conditions by downloading a crafted RAR compressed file onto a LAN-side host if the firewall has the “Anti-Malware” feature enabled.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 6.5, indicating it requires adjacent network access with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 38 products from zyxel, from zyxel, from zyxel and 35 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2024, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2024-02-20T02:15:48.793

Last Modified

2025-01-21T18:47:29.627

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 6.5 (MEDIUM)

Weaknesses
  • Type: Secondary
    CWE-476
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Operating System zyxel atp100_firmware < 5.37 Yes
Operating System zyxel atp100_firmware 5.37 Yes
Operating System zyxel atp100_firmware 5.37 Yes
Hardware zyxel atp100 - No
Operating System zyxel atp100w_firmware < 5.37 Yes
Operating System zyxel atp100w_firmware 5.37 Yes
Operating System zyxel atp100w_firmware 5.37 Yes
Hardware zyxel atp100w - No
Operating System zyxel atp200_firmware < 5.37 Yes
Operating System zyxel atp200_firmware 5.37 Yes
Operating System zyxel atp200_firmware 5.37 Yes
Hardware zyxel atp200 - No
Operating System zyxel atp500_firmware < 5.37 Yes
Operating System zyxel atp500_firmware 5.37 Yes
Operating System zyxel atp500_firmware 5.37 Yes
Hardware zyxel atp500 - No
Operating System zyxel atp700_firmware < 5.37 Yes
Operating System zyxel atp700_firmware 5.37 Yes
Operating System zyxel atp700_firmware 5.37 Yes
Hardware zyxel atp700 - No
Operating System zyxel atp800_firmware < 5.37 Yes
Operating System zyxel atp800_firmware 5.37 Yes
Operating System zyxel atp800_firmware 5.37 Yes
Hardware zyxel atp800 - No
Operating System zyxel usg_flex_100_firmware < 5.37 Yes
Operating System zyxel usg_flex_100_firmware 5.37 Yes
Operating System zyxel usg_flex_100_firmware 5.37 Yes
Hardware zyxel usg_flex_100 - No
Operating System zyxel usg_flex_100ax_firmware < 5.37 Yes
Operating System zyxel usg_flex_100ax_firmware 5.37 Yes
Operating System zyxel usg_flex_100ax_firmware 5.37 Yes
Hardware zyxel usg_flex_100ax - No
Operating System zyxel usg_flex_100h_firmware < 5.37 Yes
Operating System zyxel usg_flex_100h_firmware 5.37 Yes
Operating System zyxel usg_flex_100h_firmware 5.37 Yes
Hardware zyxel usg_flex_100h - No
Operating System zyxel usg_flex_100w_firmware < 5.37 Yes
Operating System zyxel usg_flex_100w_firmware 5.37 Yes
Operating System zyxel usg_flex_100w_firmware 5.37 Yes
Hardware zyxel usg_flex_100w - No
Operating System zyxel usg_flex_200_firmware < 5.37 Yes
Operating System zyxel usg_flex_200_firmware 5.37 Yes
Operating System zyxel usg_flex_200_firmware 5.37 Yes
Hardware zyxel usg_flex_200 - No
Operating System zyxel usg_flex_200h_firmware < 5.37 Yes
Operating System zyxel usg_flex_200h_firmware 5.37 Yes
Operating System zyxel usg_flex_200h_firmware 5.37 Yes
Hardware zyxel usg_flex_200h - No
Operating System zyxel usg_flex_200hp_firmware < 5.37 Yes
Operating System zyxel usg_flex_200hp_firmware 5.37 Yes
Operating System zyxel usg_flex_200hp_firmware 5.37 Yes
Hardware zyxel usg_flex_200hp - No
Operating System zyxel usg_flex_50_firmware < 5.37 Yes
Operating System zyxel usg_flex_50_firmware 5.37 Yes
Operating System zyxel usg_flex_50_firmware 5.37 Yes
Hardware zyxel usg_flex_50 - No
Operating System zyxel usg_flex_500_firmware < 5.37 Yes
Operating System zyxel usg_flex_500_firmware 5.37 Yes
Operating System zyxel usg_flex_500_firmware 5.37 Yes
Hardware zyxel usg_flex_500 - No
Operating System zyxel usg_flex_500h_firmware < 5.37 Yes
Operating System zyxel usg_flex_500h_firmware 5.37 Yes
Operating System zyxel usg_flex_500h_firmware 5.37 Yes
Hardware zyxel usg_flex_500h - No
Operating System zyxel usg_flex_50w_firmware < 5.37 Yes
Operating System zyxel usg_flex_50w_firmware 5.37 Yes
Operating System zyxel usg_flex_50w_firmware 5.37 Yes
Hardware zyxel usg_flex_50w - No
Operating System zyxel usg_flex_700_firmware < 5.37 Yes
Operating System zyxel usg_flex_700_firmware 5.37 Yes
Operating System zyxel usg_flex_700_firmware 5.37 Yes
Hardware zyxel usg_flex_700 - No
Operating System zyxel usg_flex_700h_firmware < 5.37 Yes
Operating System zyxel usg_flex_700h_firmware 5.37 Yes
Operating System zyxel usg_flex_700h_firmware 5.37 Yes
Hardware zyxel usg_flex_700h - No
References

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For zyxel's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.