Zyxel Usg Flex 50 Firmware vulnerabilities

23 CVEs affecting Zyxel Usg Flex 50 Firmware, 3 known to be exploited (CISA KEV), with EPSS scores. Latest: CVE-2023-6764, published 2024-02-20.

Highest priority

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

CVE-2023-28771: Zyxel Multiple Firewalls OS Command Injection Vulnerability, published 2023-04-25. Critical severity, CVSS 9.8. Actively exploited: in CISA KEV since 2023-05-31. EPSS: 99.3% chance of exploitation in the next 30 days. Improper error message handling in Zyxel ZyWALL/USG series firmware versions 4.60 through 4.73, VPN series firmware versions 4.60 through 5.35, USG FLEX series firmware versions 4.60 through 5.35,…
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-2022-38547, published 2023-02-07. High severity, CVSS 7.2. EPSS: 2.8% chance of exploitation in the next 30 days. A post-authentication command injection vulnerability in the CLI command of Zyxel ZyWALL/USG series firmware versions 4.20 through 4.72, VPN series firmware versions 4.30 through 5.32, USG FLEX…
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-2023-6398, published 2024-02-20. High severity, CVSS 7.2. EPSS: 1.3% chance of exploitation in the next 30 days. A post-authentication command injection vulnerability in the file upload binary in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50…
CVE-2023-22913, published 2023-04-24. High severity, CVSS 8.1. EPSS: 1.3% chance of exploitation in the next 30 days. A post-authentication command injection vulnerability in the “account_operator.cgi” CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, and VPN series firmware versions 4.30…
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-2023-22914, published 2023-04-24. High severity, CVSS 7.2. EPSS: 1% chance of exploitation in the next 30 days. A path traversal vulnerability in the “account_print.cgi” CGI program of Zyxel USG FLEX series firmware versions 4.50 through 5.35, and VPN series firmware versions 4.30 through 5.35, which could…

Latest

CVE-2023-6764, published 2024-02-20. High severity, CVSS 8.1. EPSS: 0.9% chance of exploitation in the next 30 days. A format string vulnerability in a function of the IPSec VPN feature in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50…
CVE-2023-6399, published 2024-02-20. Medium severity, CVSS 6.5. EPSS: 0.6% chance of exploitation in the next 30 days. A format string vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1, USG FLEX series firmware versions from 4.50 through 5.37 Patch 1, USG FLEX 50(W) series firmware…
CVE-2023-6397, published 2024-02-20. Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days. A null pointer dereference vulnerability in Zyxel ATP series firmware versions from 4.32 through 5.37 Patch 1 and USG FLEX series firmware versions from 4.50 through 5.37 Patch 1 could…
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-2023-34139, published 2023-07-17. High severity, CVSS 8.8. EPSS: 0.8% chance of exploitation in the next 30 days. A command injection vulnerability in the Free Time WiFi hotspot feature of the Zyxel USG FLEX series firmware versions 4.50 through 5.36 Patch 2 and VPN series firmware versions 4.20 through 5.36…
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…