Zyxel Usg 40 Firmware vulnerabilities

7 CVEs affecting Zyxel Usg 40 Firmware, 2 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2023-33010, published 2023-05-24.

Highest priority

Known exploited (CISA KEV) first, then by EPSS exploit probability.

CVE-2023-33010: Zyxel Multiple Firewalls Buffer Overflow Vulnerability, published 2023-05-24. Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2023-06-05. EPSS: 29% chance of exploitation in the next 30 days. A buffer overflow vulnerability in the ID processing function in Zyxel ATP series firmware versions 4.32 through 5.36 Patch 1, USG FLEX series firmware versions 4.50 through 5.36 Patch 1, USG FLEX…
CVE-2023-33009: Zyxel Multiple Firewalls Buffer Overflow Vulnerability, published 2023-05-24. Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2023-06-05. EPSS: 28.1% chance of exploitation in the next 30 days. A buffer overflow vulnerability in the notification function in Zyxel ATP series firmware versions 4.60 through 5.36 Patch 1, USG FLEX series firmware versions 4.60 through 5.36 Patch 1, USG FLEX…
CVE-2022-0734, published 2022-05-24. Medium severity, CVSS 6.1. EPSS: 9.4% chance of exploitation in the next 30 days. A cross-site scripting vulnerability was identified in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.35 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series…
CVE-2022-26531, published 2022-05-24. High severity, CVSS 7.8. EPSS: 6.2% chance of exploitation in the next 30 days. Multiple improper input validation flaws were identified in some CLI commands of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP…
CVE-2022-26532, published 2022-05-24. High severity, CVSS 7.8. EPSS: 4.8% chance of exploitation in the next 30 days. A argument injection vulnerability in the 'packet-trace' CLI command of Zyxel USG/ZyWALL series firmware versions 4.09 through 4.71, USG FLEX series firmware versions 4.50 through 5.21, ATP series…
CVE-2018-9129, published 2018-08-15. Medium severity, CVSS 5.9. EPSS: 1% chance of exploitation in the next 30 days. ZyXEL ZyWALL/USG series devices have a Bleichenbacher vulnerability in their Internet Key Exchange (IKE) handshake implementation used for IPsec based VPN connections.
CVE-2022-0910, published 2022-05-24. Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days. A downgrade from two-factor authentication to one-factor authentication vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.32 through 4.71, USG FLEX series firmware…