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CVE-2023-28771: Zyxel Multiple Firewalls OS Command Injection Vulnerability
Zyxel Multiple Firewalls · in CISA KEV since 2023-05-31
2023-05-31added to KEV
2023-06-21federal remediation due date
99.28%EPSS exploit probability (30 days) 99.9th percentile
9.8 CRITICALCVSS 3.1
Unknownknown ransomware use
36days from NVD publication to KEV
What it is
Zyxel ATP, USG FLEX, VPN, and ZyWALL/USG firewalls allow for improper error message handling which could allow an unauthenticated attacker to execute OS commands remotely by sending crafted packets to an affected device.
Required action (CISA)
Apply updates per vendor instructions.
| CWE | CWE-78 |
|---|---|
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD published | 2023-04-25 (Analyzed) |
Original records: NVD · CISA KEV · JSON: /api/cve/CVE-2023-28771.json · all KEV CVEs
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Get the full file: Exploited Vulnerabilities Brief – September 2026 ($29): this month's KEV additions ranked by EPSS, ransomware use and due date, ready to hand to a patch team. Checkout by Polar.