A missing authorization vulnerability in Zyxel ATP series firmware versions from V4.32 through V5.40, USG FLEX series firmware versions from V4.50 through V5.40, USG FLEX 50(W) series firmware versions from V4.16 through V5.40, and USG20(W)-VPN series firmware versions from V4.16 through V5.40 could allow a semi-authenticated attacker—who has completed only the first stage of the two-factor authentication (2FA) process—to view and download the system configuration from an affected device.
This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.1, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts confidentiality (data exposure), integrity (unauthorized modifications), for affected systems. Impacting 17 products from zyxel, from zyxel, from zyxel and 14 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2025, 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.
2025-10-21T03:15:36.563
2025-10-28T19:18:15.210
Analyzed
CVSSv3.1: 8.1 (HIGH)
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Operating System | zyxel | zld | < 5.41 | Yes |
| Hardware | zyxel | atp100 | - | No |
| Hardware | zyxel | atp100w | - | No |
| Hardware | zyxel | atp200 | - | No |
| Hardware | zyxel | atp500 | - | No |
| Hardware | zyxel | atp700 | - | No |
| Hardware | zyxel | atp800 | - | No |
| Operating System | zyxel | zld | < 5.41 | Yes |
| Hardware | zyxel | usg_flex_100 | - | No |
| Hardware | zyxel | usg_flex_100ax | - | No |
| Hardware | zyxel | usg_flex_100w | - | No |
| Hardware | zyxel | usg_flex_200 | - | No |
| Hardware | zyxel | usg_flex_50 | - | No |
| Hardware | zyxel | usg_flex_500 | - | No |
| Hardware | zyxel | usg_flex_50ax | - | No |
| Hardware | zyxel | usg_flex_700 | - | No |
| Operating System | zyxel | zld | < 5.41 | Yes |
| Hardware | zyxel | usg_20w-vpn | * | No |
| Hardware | zyxel | usg_flex_50w | - | No |
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.