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CVE-2023-28771: Zyxel Multiple Firewalls OS Command Injection Vulnerability

criticalknown exploitedpublic exploitCVE-2023-28771
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: ZyxelRemote code execution
What
Zyxel firewalls allow for improper error message handling leading to OS command injection.
Who is affected
Deployments of Zyxel ATP, USG FLEX, and other specified firewalls are affected.
Urgency
Immediate remediation is critical due to active exploitation and severity of the vulnerability.
Action
Update the firmware of affected Zyxel firewalls to mitigate the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2023-05-31
Exploitation
Observed in the wild (CISA KEV)

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

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2023-28771coverage & exploitation statusNVD · CVE.org

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