CVE Watch25 oct 2026

CVE-2026-7273

Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability

CVSS

8.8

Alto

EPSS

2.8%

p86

KEV

SÍ

21 sept 2026

Exploit Today

0-100

Publicado: 16 jun 2026 · Última mod.: 25 oct 2026 · CWE-121

EPSS · 30d

2.5%EPSS · 30 días2.8%

2026-09-282026-10-26

Ficha del catálogo KEV

Producto

Zyxel / GS1900 Series Switches

Vulnerabilidad

Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability

Añadido a KEV

21 sept 2026

Remediar antes de

24 sept 2026

Uso conocido en ransomware

Descripción resumida

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.

Acción requerida

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.

Notas

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

Descripción técnica

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.

Referencias oficiales

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