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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2026-0319
Buffer overflow vulnerability in Zyxel

Original Issue Date:June 18, 2026

Severity Rating: HIGH

Software Affected

  • Zyxel GS1900-8 version 2.90(AAHH.1)C0 and earlier
  • Zyxel GS1900-8HP version 2.90(AAHI.1)C0 and earlier
  • Zyxel GS1900-10HP version 2.90(AAZI.1)C0 and earlier
  • Zyxel GS1900-16 version 2.90(AAHJ.1)C0 and earlier
  • Zyxel GS1900-24 version 2.90(AAHL.1)C0 and earlier
  • Zyxel GS1900-24E version 2.90(AAHK.1)C0 and earlier
  • Zyxel GS1900-24EP version 2.90(ABTO.1)C0 and earlier
  • Zyxel GS1900-24HPv2 version 2.90(ABTP.1)C0 and earlier
  • Zyxel GS1900-48 version 2.90(AAHN.1)C0 and earlier
  • Zyxel GS1900-48HPv2 version 2.90(ABTQ.1)C0 and earlier

Overview

Buffer overflow vulnerability has been reported in Zyxel which could allow an attacker to execute arbitrary operating system commands on the targeted system.

Target Audience:
All end-user organizations and individuals using Zyxel.

Risk Assessment:
High risk of remote code execution.

Impact Assessment:
Potential for remote code execution.

Description

Zyxel is a networking equipment manufacturer that provides switches, routers, firewalls, wireless access points, and other network infrastructure solutions for businesses and consumers.

A vulnerability has been reported in Zyxel Communications GS1900 series switches due to a stack-based buffer overflow vulnerability in the CGI program of the switch firmware. A LAN-based, unauthenticated attacker could exploit this vulnerability to send specially crafted HTTP requests to vulnerable devices and potentially execute OS commands on the targeted system.

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary operating system commands on the targeted system.

Solution

Apply appropriate updates as mentioned by the vendor:
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

Vendor Information

Zyxel
https://www.zyxel.com/

References

 
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

CVE Name
CVE-2026-7273

Disclaimer

The information provided herein is on "as is" basis, without warranty of any kind.

Contact Information

Email: info@cert-in.org.in
Phone: +91-11-22902657

Postal address

Indian Computer Emergency Response Team (CERT-In)
Ministry of Electronics and Information Technology
Government of India
Electronics Niketan
6, CGO Complex, Lodhi Road,
New Delhi - 110 003
India

 
Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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