CVE-2026-7273· zyxel / gs1900 series switches· CWE-121
Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability
Exploited in the wild. Listed by CISA on 2026-09-21; known to be used by ransomware.
2.7%likelihood of exploitation, next 30 days
86%of all CVEs are less likely
Nonecheck to confirm it
Zyxel GS1900 series switches contain a stack-based buffer overflow vulnerability in the CGI program which could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.
No ready check is stored for this CVE. Confirm it by hand from the references.
References
Use this check only on systems you are authorised to test. Where the data comes from