Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 21/09/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| GS1900 Series Switches | Versions not published yet (product named by CISA KEV) | |
A stack-based buffer overflow vulnerability in the CGI program of Zyxel GS1900-48HPv2 firmware versions through 2.90(ABTQ.1)C0 could allow a LAN-based, unauthenticated attacker to exploit the flaw and potentially execute OS commands via a crafted HTTP request.
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