CVE-2026-7273

HIGH

Zyxel GS1900-48HPv2 Firmware - Stack-based Buffer Overflow

Title source: rule

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.

References (1)

Core 1

Core References

Vendor Advisory vendor-advisory

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

Scores

CVSS v3 8.8

Attack Vector ADJACENT_NETWORK

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Details

CWE

CWE-121

Status published

Products (10)

Zyxel/GS1900-10HP firmware <= 2.90(AAZI.1)C0

Zyxel/GS1900-16 firmware <= 2.90(AAHJ.1)C0

Zyxel/GS1900-24 firmware <= 2.90(AAHL.1)C0

Zyxel/GS1900-24E firmware <= 2.90(AAHK.1)C0

Zyxel/GS1900-24EP firmware <= 2.90(ABTO.1)C0

Zyxel/GS1900-24HPv2 firmware <= 2.90(ABTP.1)C0

Zyxel/GS1900-48 firmware <= 2.90(AAHN.1)C0

Zyxel/GS1900-48HPv2 firmware <= 2.90(ABTQ.1)C0

Zyxel/GS1900-8 firmware <= 2.90(AAHH.1)C0

Zyxel/GS1900-8HP firmware <= 2.90(AAHI.1)C0

Published Jun 16, 2026

Tracked Since Jun 16, 2026