CVE-2026-7273

HIGHCVSS 8.8Known Exploited

CISA Known Exploited Vulnerability

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

Remediation deadline: September 24, 2026

Description

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.

Timeline

Published:June 16th, 2026 3:16 AM

Last modified:September 22nd, 2026 12:10 PM

Added to KEV:September 21st, 2026

CVSS Scoring

CVSS v3: 8.8 (HIGH)

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

Affected Software

From NVD CPE configuration data

Vendors

zyxel

Products

gs1900-8_firmwaregs1900-8hp_firmwaregs1900-10hp_firmwaregs1900-16_firmwaregs1900-24_firmwaregs1900-24e_firmwaregs1900-24ep_firmwaregs1900-24hpv2_firmwaregs1900-48_firmwaregs1900-48hpv2_firmware