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CVE-2023-33009: Zyxel Multiple Firewalls Buffer Overflow Vulnerability

criticalknown exploitedCVE-2023-33009
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, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the notification function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.

CSIRTS triage

vendor: ZyxelRemote code executionDenial of service
What
Zyxel firewalls contain a buffer overflow vulnerability in the notification function.
Who is affected
Deployments of Zyxel ATP, USG FLEX, and other specified firewalls are affected.
Urgency
Immediate remediation is necessary due to active exploitation and critical severity.
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
2023-06-05
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2023-33009

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-2023-33009coverage & exploitation statusNVD · CVE.org

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