HIGH CISA-KEV ACTIVELY EXPLOITED

CVE-2026-7273

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.

Affected Products

Zyxel: GS1900 Series Switches

References

Published: 2026-09-21 · Source: CISA-KEV · Feed updated: 2026-09-21

This high severity vulnerability was published on 2026-09-21 via CISA-KEV. ⚠ This vulnerability is in the CISA Known Exploited Vulnerabilities (KEV) catalog — it is being actively exploited in the wild. Affected: Zyxel: GS1900 Series Switches.

Risk Timeline

CVE Disclosed2026-09-21 · 0 days ago

CISA KEV — Actively ExploitedU.S. federal agencies required to patch · confirmed threat-actor activity

Remediation Resources

CISA / KEV

www.cisa.gov/known-exploited-vulnerabilities-catalog

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-7273

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