GoKawiilCISA mandates federal patch for actively exploited Zyxel GS1900 switch flaw
CISA added CVE-2026-7273, a stack-based buffer overflow in Zyxel GS1900 series switches, to its Known Exploited Vulnerabilities catalog after confirming active attacks. The flaw allows unauthenticated LAN attackers to run OS commands via crafted HTTP requests, and federal agencies must secure affected devices by Thursday under Binding Operational Directive 26-04. Zyxel issued firmware fixes on June 16 but has not yet updated its advisory to acknowledge exploitation.