Rewterz Threat Advisory –Multiple Zyxel Products Vulnerabilities

Severity

High

Analysis Summary

CVE-2023-22922 CVSS:7.5

Zyxel NBG-418N is vulnerable to a denial of service, caused by a buffer overflow vulnerability. By sending crafted packets, a remote attacker could exploit this vulnerability to cause a denial of service.

CVE-2023-22923 CVSS:6.5

Zyxel NBG-418N is vulnerable to a denial of service, caused by a format string vulnerability in a binary. By sending a specially crafted request, a remote authenticated attacker could exploit this vulnerability to cause a denial of service.

CVE-2023-22924 CVSS:4.9

Zyxel NBG-418N is vulnerable to a denial of service, caused by a buffer overflow vulnerability. By executing crafted CLI commands on a vulnerable device, a remote authenticated attacker could exploit this vulnerability to cause a denial of service.

CVE-2023-22921 CVSS:7.2

Zyxel NBG-418N is vulnerable to cross-site scripting, caused by improper validation of user-supplied input. A remote authenticated attacker could exploit this vulnerability to inject malicious script into a Web page which would be executed in a victim’s Web browser within the security context of the hosting Web site, once the page is viewed. An attacker could use this vulnerability to steal the victim’s cookie-based authentication credentials.

CVE-2023-22919 CVSS:8.8

Zyxel NBG6604 home router could allow a remote authenticated attacker to execute arbitrary commands on the system. By sending a specially crafted request, an attacker could exploit this vulnerability to execute arbitrary commands on the system.

Impact

• Denial of Service
• Cross-Site Scripting
• Command Execution

Indicators Of Compromise

CVE

• CVE-2023-22922
• CVE-2023-22923
• CVE-2023-22924
• CVE-2023-22921
• CVE-2023-22919

Affected Vendors

Zyxel

Affected Products

• Zyxel NBG-418N v2 firmware 1.00(AARP.13)C0
• Zyxel NBG6604 firmware 1.01(ABIR.0)C0

Remediation

Refer to Zyxel Web site for patch, upgrade or suggested workaround information.

Zyxel NBG-418N

Zyxel NBG6604