Date：2023/05/04

【Security Vulnerability Warning】There are security vulnerabilities, CVE-2023-27991 and CVE-2023-28771, in Zyxel firewall. Please confirm and update as soon as possible.

Subject: There are security vulnerabilities, CVE-2023-27991 and CVE-2023-28771, in Zyxel firewall. Please confirm and update as soon as possible.

Description:
For details, please refer to the following links.

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls

https://nvd.nist.gov/vuln/detail/CVE-2023-27991

https://nvd.nist.gov/vuln/detail/CVE-2023-28771

https://thehackernews.com/2023/04/zyxel-firewall-devices-vulnerable-to.html

Network System Division
Computer and Communication Center