re: Zyxel VPN Series Pre-auth Remote Command Execution

On January 25, 2024, SSD Secure Disclosure posted a disclosure titled Zyxel VPN Series Pre-auth Remote Command Execution. The writeup describes an unauthenticated remote command injection vulnerability affecting Zyxel VPN firewalls. That caught VulnCheck researchers attention. The Zyxel VPN series Read More …

DDoS Botnets Target Zyxel Vulnerability CVE-2023-28771

In June 2023, FortiGuard Labs detected the propagation of several DDoS botnets exploiting the Zyxel vulnerability (CVE-2023-28771). This vulnerability is characterized by a command injection flaw affecting multiple firewall models that could potentially allow an unauthorized attacker to execute arbitrary Read More …

Warning issued over ‘widespread’ exploitation of Zyxel NAS devices

Security researchers at two companies have issued warnings over ‘widespread’ exploitation of Zyxel network devices. Researchers at Rapid7 raised the alarm over the ongoing exploitation of a critical authenticated command injection vulnerability, tracked as CVE-2023-28771, that was found to affect Read More …

Zyxel urges customers to patch critical firewall bypass vulnerability

Zyxel is urging customers to immediately patch a critical vulnerability in the vendor’s firewall software. In a security advisory published this week, the Taiwanese networking giant said the security flaw can lead to the circumvention of firewall protection in Zyxel Read More …

Backdoor account discovered in more than 100,000 Zyxel firewalls, VPN gateways

More than 100,000 Zyxel firewalls, VPN gateways, and access point controllers contain a hardcoded admin-level backdoor account that can grant attackers root access to devices via either the SSH interface or the web administration panel. The backdoor account, discovered by Read More …

New Mirai Variant Targets Zyxel Network-Attached Storage Devices

As soon as the proof-of-concept (PoC) for CVE-2020-9054 was made publicly available last month, this vulnerability was promptly abused to infect vulnerable versions of Zyxel network-attached storage (NAS) devices with a new Mirai variant – Mukashi. Mukashi brute forces the logins using Read More …