VULNERABILITY INTELLIGENCE

CVE-2023-28771

CVSS score9.8 CRITICAL
EPSS probability99.28%
CISA KEVKnown exploited vulnerability
Published2023-04-25
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Known Exploited Vulnerability

Zyxel Multiple Firewalls OS Command Injection Vulnerability

Vendor / product: Zyxel / Multiple Firewalls

Description

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.

Weakness classification

  • security@zyxel.com.tw: CWE-78
  • nvd@nist.gov: CWE-78

Primary references