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Zyxel vulnerabilities being exploited

1 Zyxel flaw was confirmed exploited in the wild in the past 365 days, across 1 product: GS1900 Series Switches. If you run any of them, patch these first.

AddedExploited vulnerabilityFix by
2026-09-21CVE-2026-7273 GS1900 Series Switches
Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability

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.

2026-09-24
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Source: CISA Known Exploited Vulnerabilities catalog 2026.10.29 (live). A listing means some versions are affected: check yours in the advisory. Guidance only.