June 5, 2023 · Applied Cybernetics Group
CVE-2023-33010 — Zyxel Multiple Firewalls
Zyxel Multiple Firewalls Buffer Overflow Vulnerability
- Added to KEV
2023-06-05- Federal due date
2023-06-26- Vendor
- Zyxel
- Product
- Multiple Firewalls
- EPSS
- 97.9th percentile (score 0.288, as of
2026-07-13) - NVD CVSS v3.1
- —
- Ransomware use
- Unknown
- Upstream
- https://nvd.nist.gov/vuln/detail/CVE-2023-33010
CISA short description
Zyxel ATP, USG FLEX, USG FLEX 50(W), USG20(W)-VPN, VPN, and ZyWALL/USG firewalls contain a buffer overflow vulnerability in the ID processing function that could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions and remote code execution on an affected device.
Required action
Apply updates per vendor instructions.