HIGHVulnerability
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CISA KEV: Zyxel GS1900 Series Switches — Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability

·Source: CISA KEV

Updated:

Executive Summary

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.

Analysis

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. Added to CISA Known Exploited Vulnerabilities catalog on 2026-09-21. Remediation due: 2026-09-24.

Indicators of Compromise (1)

CVE (1)
CVE-2026-7273
NVDMITRE CVE
Source Attribution

Originally published by CISA KEV on Sep 21, 2026. Verified by: CISA.

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