CVE-2026-7273
Zyxel GS1900 Series Switches Stack-Based Buffer Overflow Vulnerability
Summary
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.
Affected software
Vendor: Zyxel · Product: GS1900 Series Switches
Weakness types (CWE):
What to do
This vulnerability appears in CISA's Known Exploited Vulnerabilities catalog, meaning it is being exploited in the wild. Prioritize patching affected systems and verify exposure across your estate.
Related vulnerabilities in Zyxel
| CVE | Name | EPSS | Exploited |
|---|---|---|---|
| CVE-2020-9054 | Zyxel Multiple NAS Devices OS Command Injection Vulnerability | 100.0% | Yes |
| CVE-2022-30525 | Zyxel Multiple Firewalls OS Command Injection Vulnerability | 99.9% | Yes |
| CVE-2023-28771 | Zyxel Multiple Firewalls OS Command Injection Vulnerability | 99.3% | Yes |
| CVE-2017-18368 | Zyxel P660HN-T1A Routers Command Injection Vulnerability | 94.5% | Yes |
| CVE-2020-29583 | Zyxel Multiple Products Use of Hard-Coded Credentials Vulnerability | 90.2% | Yes |
| CVE-2023-27992 | Zyxel Multiple NAS Devices Command Injection Vulnerability | 82.3% | Yes |
| CVE-2017-6884 | Zyxel EMG2926 Routers Command Injection Vulnerability | 33.0% | Yes |
| CVE-2023-33010 | Zyxel Multiple Firewalls Buffer Overflow Vulnerability | 29.0% | Yes |
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