Vulnerability Monitor

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CVE-2023-5650

An improper privilege management vulnerability in the ZySH of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37, could allow an authenticated local attacker to modify the URL of the registration page in the web GUI of an affected device.

Security Impact Summary

This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.5, requiring local system access to exploit with relatively low complexity without requiring user interaction requiring only low-level privileges . The vulnerability impacts integrity (unauthorized modifications), for affected systems. Impacting 20 products from zyxel, from zyxel, from zyxel and 17 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2023, 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

2023-11-28T02:15:43.380

Last Modified

2024-11-21T08:42:11.453

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.5 (MEDIUM)

Weaknesses

Type: Secondary
CWE-269

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Operating System	zyxel	zld	≤ 5.37	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	≤ 5.37	Yes
Hardware	zyxel	usg_flex_100	-	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_50w	-	No
Hardware	zyxel	usg_flex_700	-	No
Operating System	zyxel	zld	≤ 5.37	Yes
Hardware	zyxel	usg_20w-vpn	-	No
Hardware	zyxel	vpn50w	-	No
Operating System	zyxel	zld	≤ 5.37	Yes
Hardware	zyxel	vpn100	-	No
Hardware	zyxel	vpn1000	-	No
Hardware	zyxel	vpn300	-	No
Hardware	zyxel	vpn50	-	No

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps Vendor Advisory ([email protected])
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)

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.