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CVE-2026-7273: Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability

High · CVSS 8.8 (CVSS 3.1)KEV known exploitedEPSS 2.8%, 86th percentilePublished Updated Assigner: Zyxel

In CISA’s Known Exploited Vulnerabilities catalog: Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability.

Added , federal remediation due . Known ransomware use: Unknown.

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.

Description

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.

Vector CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H · CWE-121

Status incidents that name it

No tracked status incident names this CVE.

Affected vendors and products

Zyxel: GS1900-10HP firmwareZyxel: GS1900-16 firmwareZyxel: GS1900-24E firmwareZyxel: GS1900-24EP firmwareZyxel: GS1900-24 firmwareZyxel: GS1900-24HPv2 firmwareZyxel: GS1900-48 firmwareZyxel: GS1900-48HPv2 firmwareZyxel: GS1900-8 firmwareZyxel: GS1900-8HP firmware

References

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