VPN series firmware vulnerabilities

22 known vulnerabilities in VPN series firmware from Zyxel. 22 are rated high or critical, and 4 have been exploited in real attacks. Each entry lists the affected versions and the release that fixes it, where the vendor has published one.

Latest first

• 7.5 High severity

  ATP series firmware: Integer Overflow or Wraparound

  CVE-2023-4398Nov 28, 2023Zyxel

  An integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions

• 8.0 High severity

  ATP series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2023-34141Jul 17, 2023Zyxel

  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 Patch 2, USG FLEX 50(W) series firmware versions 5.00 through

• 8.8 High severity

  USG FLEX series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2023-34139Jul 17, 2023Zyxel

  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 Patch 2, could allow an unauthenticated, LAN-based attacker to e

• 8.0 High severity

  ATP series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2023-34138Jul 17, 2023Zyxel

  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, USG FLEX 50(W) series firmware versions 4.60 through 5.36 Patc

• 8.8 High severity

  ATP series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2023-33012Jul 17, 2023ZyxelEPSS 9.88%

  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 FLEX 50(W) series firmware versions 5.10 through 5.36 Patch 2, U

• 8.8 High severity

  ATP series firmware: Use of Externally-Controlled Format String

  CVE-2023-33011Jul 17, 2023Zyxel

  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 versions 5.10 through 5.36 Patch 2, USG20(W)-VPN series firmware vers

• 8.8 High severity

  ATP series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2023-28767Jul 17, 2023Zyxel

  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) series firmware versions 5.10 through 5.36, USG20(W)-VPN series fi

• 9.8 Critical severity

  Zyxel Multiple Firewalls Buffer Overflow Exploited

  CVE-2023-33010May 24, 2023ZyxelEPSS 29%

  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 50(W) firmware versions 4.25 through 5.36 Patch 1, USG20(W)-VPN

• 9.8 Critical severity

  Zyxel Multiple Firewalls Buffer Overflow Exploited

  CVE-2023-33009May 24, 2023ZyxelEPSS 28.1%

  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 50(W) firmware versions 4.60 through 5.36 Patch 1, USG20(W)-VPN

• 9.8 Critical severity

  Zyxel Multiple Firewalls OS Command Injection Exploited

  CVE-2023-28771Apr 25, 2023ZyxelEPSS 99.3%

  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, and ATP series firmware versions 4.60 through 5.35, which could

• 8.8 High severity

  ATP series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2023-27991Apr 24, 2023ZyxelEPSS 1.45%

  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) firmware versions 4.16 through 5.35, USG20(W)-VPN firmware v

• 7.5 High severity

  ATP series firmware: Buffer Copy without Checking Size of Input

  CVE-2023-22917Apr 24, 2023Zyxel

  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 versions 5.10 through 5.32, USG20(W)-VPN firmware versions 5.1

• 8.1 High severity

  The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX…

  CVE-2023-22916Apr 24, 2023Zyxel

  The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware

• 7.5 High severity

  USG FLEX series firmware: Buffer Copy without Checking Size of Input

  CVE-2023-22915Apr 24, 2023ZyxelEPSS 1.05%

  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 firmware versions 4.30 through 5.35, and VPN series firmware

• 7.2 High severity

  USG FLEX series firmware: Improper Limitation of a Pathname to a Restricted Directory

  CVE-2023-22914Apr 24, 2023ZyxelEPSS 1.03%

  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 allow a remote authenticated attacker with administrator privile

• 8.1 High severity

  USG FLEX series firmware: Improper Neutralization of Special Elements used in a Command

  CVE-2023-22913Apr 24, 2023ZyxelEPSS 1.29%

  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 through 5.35, which could allow a remote authenticated attacker

• 7.2 High severity

  ZyWALL/USG series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2022-38547Feb 7, 2023ZyxelEPSS 2.83%

  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 series firmware versions 4.50 through 5.32, and ATP series firmwar

• 7.8 High severity

  USG FLEX 100(W) firmware: Improper Privilege Management

  CVE-2022-30526Jul 19, 2022ZyxelEPSS 1.14%

  A privilege escalation vulnerability was identified in the CLI command of Zyxel USG FLEX 100(W) firmware versions 4.50 through 5.30, USG FLEX 200 firmware versions 4.50 through 5.30, USG FLEX 500 firmware versions 4.50 through 5.30, USG FLEX 700 firmware versi

• 7.8 High severity

  USG/ZyWALL series firmware: Improper Neutralization of Special Elements used in an OS Command

  CVE-2022-26532May 24, 2022ZyxelEPSS 4.79%

  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 firmware versions 4.32 through 5.21, VPN series firmware versio

• 7.8 High severity

  Multiple improper input validation flaws were identified in some CLI commands of Zyxel…

  CVE-2022-26531May 24, 2022ZyxelEPSS 6.37%

  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 series firmware versions 4.32 through 5.21, VPN series firmwa

• 9.8 Critical severity

  Zyxel Multiple Firewalls OS Command Injection Exploited

  CVE-2022-30525May 12, 2022ZyxelEPSS 99.9%

  A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmw

• 9.8 Critical severity

  USG/ZyWALL series firmware: Improper Authentication

  CVE-2022-0342Mar 28, 2022ZyxelEPSS 95.1%

  An authentication bypass vulnerability in the CGI program of Zyxel USG/ZyWALL series firmware versions 4.20 through 4.70, USG FLEX series firmware versions 4.50 through 5.20, ATP series firmware versions 4.32 through 5.20, VPN series firmware versions 4.30 thr