Zyxel Multiple Firewalls: 2 exploited vulnerabilities (CVE-2023-33009, CVE-2023-33010)
Zyxel Multiple Firewalls
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. 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. Added to CISA KEV on 2023-06-05.
Why this severity: CVSS 9.8 (NVD), actively exploited (CISA KEV)
- Started
- Jun 5, 2023
- Closed
- Jun 5, 2023
Affected
- See vendor advisory / CISA notes (versions not always listed in KEV feed)
Fixed in
- See vendor advisory linked in sources
Timeline2
CISA added CVE-2023-33009 to the KEV catalog (due 2023-06-26).
CISA added CVE-2023-33010 to the KEV catalog (due 2023-06-26).
Advisories4
Notes & caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. Exact affected/fixed version strings are not always in the KEV record — verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier). Grouped: same vendor/product added to KEV on the same day.
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