Home / Vulnerabilities / CVE-2023-28771
CRITICAL SEVERITY
CVE-2023-28771 Zyxel · Multiple Firewalls

Zyxel Multiple Firewalls OS Command Injection Vulnerability

Technical Severity

CVSS v3.1 Metrics

CRITICAL
9.8 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Likelihood

EPSS Prediction

94.35 %
Predictive Probability
Percentile Rank
100.0 th

Documented as more likely to be exploited than 100.0% of known CVEs.

Detection Date

May 31, 2023

Remediation Due

Jun 21, 2023

CISA Catalog Active

Threat Analysis

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.

Remediation Directive

Apply updates per vendor instructions.

External Intelligence

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-remote-command-injection-vulnerability-of-firewalls
NVD

National Vulnerability Database

https://nvd.nist.gov/vuln/detail/CVE-2023-28771