Zyxel Usg 20w-VPN Firmware vulnerabilities

19 CVEs affecting Zyxel Usg 20w-VPN Firmware, 2 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2023-34141, published 2023-07-17.

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-2023-33012, published 2023-07-17. High severity, CVSS 8.8. EPSS: 9.9% chance of exploitation in the next 30 days. A command injection vulnerability in the configuration parser of the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG…
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-2023-27991, published 2023-04-24. High severity, CVSS 8.8. EPSS: 1.5% chance of exploitation in the next 30 days. The post-authentication command injection vulnerability in the CLI command of Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W)…
CVE-2023-22915, published 2023-04-24. High severity, CVSS 7.5. EPSS: 1.1% chance of exploitation in the next 30 days. A buffer overflow vulnerability in the “fbwifi_forward.cgi” CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.30 through 5.35, USG20(W)-VPN…
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-2023-22917, published 2023-04-24. High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days. A buffer overflow vulnerability in the “sdwan_iface_ipc” binary of Zyxel ATP series firmware versions 5.10 through 5.32, USG FLEX series firmware versions 5.00 through 5.32, USG FLEX 50(W) firmware…

Latest

CVE-2023-34141, published 2023-07-17. High severity, CVSS 8.0. EPSS: 0.7% chance of exploitation in the next 30 days. A command injection vulnerability in the access point (AP) management feature of the Zyxel ATP series firmware versions 5.00 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36…
CVE-2023-34140, published 2023-07-17. Medium severity, CVSS 6.5. EPSS: 0.3% chance of exploitation in the next 30 days. A buffer overflow vulnerability in the Zyxel ATP series firmware versions 4.32 through 5.36 Patch 2, USG FLEX series firmware versions 4.50 through 5.36 Patch 2, USG FLEX 50(W) series firmware…
CVE-2023-34138, published 2023-07-17. High severity, CVSS 8.0. EPSS: 0.7% chance of exploitation in the next 30 days. A command injection vulnerability in the hotspot management feature of the Zyxel ATP series firmware versions 4.60 through 5.36 Patch 2, USG FLEX series firmware versions 4.60 through 5.36 Patch 2, …
CVE-2023-33011, published 2023-07-17. High severity, CVSS 8.8. EPSS: 0.3% chance of exploitation in the next 30 days. A format string vulnerability in the Zyxel ATP series firmware versions 5.10 through 5.36 Patch 2, USG FLEX series firmware versions 5.00 through 5.36 Patch 2, USG FLEX 50(W) series firmware…
CVE-2023-28767, published 2023-07-17. High severity, CVSS 8.8. EPSS: 0.4% chance of exploitation in the next 30 days. The configuration parser fails to sanitize user-controlled input in the Zyxel ATP series firmware versions 5.10 through 5.36, USG FLEX series firmware versions 5.00 through 5.36, USG FLEX 50(W)…
CVE-2023-27990, published 2023-04-24. Medium severity, CVSS 4.8. EPSS: 0.3% chance of exploitation in the next 30 days. The cross-site scripting (XSS) vulnerability in Zyxel ATP series firmware versions 4.32 through 5.35, USG FLEX series firmware versions 4.50 through 5.35, USG FLEX 50(W) firmware versions 4.16…