CVE-2026-7273

HIGH CISA KEV

ACT NOW Priority: 0.24 BB Relevance: 63/100

Published: 2026-06-16 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Adjacent Low Complexity No Auth No Interaction Conf. Impact Integ. Impact

CVSS Vector Breakdown

AV: Adjacent

AC: Low

PR: None

UI: None

S: Unchanged

C: High

I: High

A: High

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.

CISA Known Exploited Vulnerability

Vendor / Product Zyxel — GS1900 Series Switches

Date Added 2026-09-21

Remediation Due 2026-09-24

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

Weakness Classification (1)

CWE-121

Affected Software (10)

Vendor	Product	Version
zyxel	gs1900-10hp_firmware	< 2.90\(aazi.2\)c0
zyxel	gs1900-16_firmware	< 2.90\(aahj.2\)c0
zyxel	gs1900-24_firmware	< 2.90\(aahl.2\)c0
zyxel	gs1900-24e_firmware	< 2.90\(aahk.2\)c0
zyxel	gs1900-24ep_firmware	< 2.90\(abto.2\)c0
zyxel	gs1900-24hpv2_firmware	< 2.90\(abtp.2\)c0
zyxel	gs1900-48_firmware	< 2.90\(aahn.2\)c0
zyxel	gs1900-48hpv2_firmware	< 2.90\(abtq.2\)c0
zyxel	gs1900-8_firmware	< 2.90\(aahh.2\)c0
zyxel	gs1900-8hp_firmware	< 2.90\(aahi.2\)c0