Coverage › CVE-2026-7273

CVE-2026-7273 Unmapped

Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability

Vendor / product

Zyxel — GS1900 Series Switches

Description (CISA)

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 KEV

2026-09-21 — after the latest CTID mapping snapshot (2025-07-28)

Due date

2026-09-24

Required action

Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.

Known ransomware use

Unknown

Forensic triage (CISA)

Yes

CWE

CWE-121

CISA notes

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-stack-based-buffer-overflow-vulnerability-in-gs1900-series-switches-06-16-2026
BOD 26-04: https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk
Forensics Triage Requirements: https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk
https://nvd.nist.gov/vuln/detail/CVE-2026-7273

Elsewhere

cve.org · NVD · CISA KEV · JSON

ATT&CK techniques