Ethical Hacking News
U.S. CISA adds Zyxel flaw to its Known Exploited Vulnerabilities catalog, warning of a critical stack-based buffer overflow vulnerability that could allow attackers to execute arbitrary OS commands on network devices.
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical vulnerability in Zyxel GS1900 Series Switches to its Known Exploited Vulnerabilities (KEV) catalog. The vulnerability, CVE-2026-7273, has a CVSS score of 8.8 and is a stack-based buffer overflow that could allow attackers to execute arbitrary operating system commands. The vulnerability affects the CGI component of Zyxel's GS1900 switch firmware and could potentially allow attackers to gain unauthorized access to the network. CISA has ordered federal agencies to fix the flaw by September 24, 2026, and recommends that private organizations review the KEV catalog and address the vulnerabilities in their infrastructure. Experts warn that organizations must take immediate action to patch the vulnerability and prevent potential attacks. The discovery of this vulnerability highlights the importance of regularly monitoring and patching network devices to prevent attacks. Organizations must prioritize security and take proactive steps to protect against potential threats.
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has recently added a critical vulnerability in the Zyxel GS1900 Series Switches to its Known Exploited Vulnerabilities (KEV) catalog. The vulnerability, tracked as CVE-2026-7273, has a CVSS score of 8.8, indicating a high level of severity and potential impact.
The vulnerability is a stack-based buffer overflow that could allow attackers to execute arbitrary operating system commands. According to the CISA advisory, an unauthenticated attacker on the local network could exploit the flaw by sending a specially crafted HTTP request and potentially gain the ability to run OS commands on the device. This could have significant consequences for organizations that use Zyxel network devices, as it could potentially allow attackers to gain unauthorized access to the network.
The vulnerability affects the CGI component of Zyxel's GS1900 switch firmware, which is used in various network devices. Zyxel has credited Lei Gu, Jun Cao, Zhiqing Rui, Jingzheng Wu, and Tianyue Luo from ISCAS with finding and reporting the flaw. At the time of writing, Zyxel had not updated its advisory to confirm whether the vulnerability was being actively exploited.
CISA has ordered federal agencies to fix the flaw by September 24, 2026, and recommends that private organizations review the KEV catalog and address the vulnerabilities in their infrastructure. Experts also warn that organizations must take immediate action to patch the vulnerability and prevent potential attacks.
The discovery of this vulnerability highlights the importance of regularly monitoring and patching network devices to prevent attacks. It also underscores the need for organizations to have robust security measures in place to protect against potential threats.
In recent months, there have been several high-profile vulnerabilities discovered in network devices, including a critical flaw in the Veeam Agent Privilege Escalation vulnerability. These discoveries demonstrate the ongoing threat landscape and the need for organizations to remain vigilant and proactive in their security efforts.
As organizations continue to navigate the complex and ever-evolving threat landscape, it is essential to prioritize security and take proactive steps to protect against potential threats. By staying informed and up-to-date on the latest vulnerabilities and security best practices, organizations can help ensure their networks and devices remain secure and protected.
Related Information:
https://www.ethicalhackingnews.com/articles/The-Zyxel-Vulnerability-A-Critical-Flaw-in-Network-Devices-ehn.shtml
https://securityaffairs.com/199518/hacking/u-s-cisa-adds-zyxel-flaw-to-its-known-exploited-vulnerabilities-catalog.html
https://www.bleepingcomputer.com/news/security/cisa-orders-feds-to-patch-actively-exploited-zyxel-flaw-by-thursday/
https://nvd.nist.gov/vuln/detail/CVE-2026-7273
https://www.cvedetails.com/cve/CVE-2026-7273/
Published: Tue Sep 22 05:45:07 2026 by llama3.2 3B Q4_K_M
