CVE-2026-7273CISA KEVEPSS p84.2%

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

Zyxel / GS1900 Series Switches

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.

Scoring

CVSS 8.8 ()
VectorCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS2.50% probability of exploitation · percentile 84.2% · 2026-10-05T12:00:23Z
Last modified2026-09-22

CISA KEV entry

Added to KEV: 2026-09-21

Sourced from NVD + CISA KEV + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.