CVE-2026-7273

Name of the Vulnerable Software and Affected Versions Zyxel GS1900-48HPv2 versions prior to 2.90(ABTQ.1)C0

Description A stack-based buffer overflow exists in the CGI program of the device. A stack-based buffer overflow occurs when a program writes more data to a buffer located on the stack than the buffer is allocated to hold, potentially overwriting adjacent memory. This flaw allows an unauthenticated attacker on the local area network (LAN) to execute operating system commands by sending a specially crafted HTTP request.

Recommendations Update the firmware to a version later than 2.90(ABTQ.1)C0.