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CVE-2023-28771Zyxel Multiple Firewalls OS Command Injection Vulnerability
Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35, and ATP series firmware versions 4.60 through 5.35, which could allow an unauthenticated attacker to execute some OS commands remotely by sending crafted packets to an affected device.
9.8 CRITICALEPSS 99.28%⚡ Known Exploited (CISA KEV)NVD: Analyzed
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 9.8 | CRITICAL | 3.1Zyxel (CNA) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
CISA required action
⚡ Known exploited · remediation due Jun 21, 2023
Apply updates per vendor instructions.
Details
- CVE ID
- CVE-2023-28771
- Status
- Analyzed
- Assigner (CNA)
- Zyxel
- Published
- Apr 25, 2023
- Last modified
- 2026-06-17 05:48 UTC
- Weaknesses
- CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Affected Products
As published by the CNA in the CVE record.
ZyxelZyWALL/USG series firmware1 version range
- 4.60 through 4.73
ZyxelVPN series firmware1 version range
- 4.60 through 5.35
ZyxelUSG FLEX series firmware1 version range
- 4.60 through 5.35
ZyxelATP series firmware1 version range
- 4.60 through 5.35
References
- packetstormsecurity.com http://packetstormsecurity.com/files/172820/Zyxel-IKE-Packet-Decoder-Unauthenticated-Remote-Code-Execution.html
- zyxel.com https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls
- cisa.gov https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-28771