CVE-2022-2030: Zyxel ATP100 Firmware

Medium severity, CVSS 6.5. EPSS: 1.4% chance of exploitation in the next 30 days.

A directory traversal vulnerability caused by specific character sequences within an improperly sanitized URL was identified in some CGI programs 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 versions 4.50 through 5.30, USG FLEX 50(W) firmware versions 4.16 through 5.30, USG20(W)-VPN firmware versions 4.16 through 5.30, ATP series firmware versions 4.32 through 5.30, VPN series firmware versions 4.30 through 5.30, USG/ZyWALL series firmware versions 4.11 through 4.72, that could allow an authenticated attacker to access some restricted files on a vulnerable device.

Affected products

  • Zyxel ATP100 Firmware: from 4.32, up to and including 5.30
  • Zyxel ATP100W Firmware: from 4.32, up to and including 5.30
  • Zyxel ATP200 Firmware: from 4.32, up to and including 5.30
  • Zyxel ATP500 Firmware: from 4.32, up to and including 5.30
  • Zyxel ATP700 Firmware: from 4.32, up to and including 5.30
  • Zyxel ATP800 Firmware: from 4.32, up to and including 5.30
  • Zyxel USG20-VPN Firmware: from 4.30, up to and including 5.30
  • Zyxel USG20W-VPN Firmware: from 4.20, up to and including 5.30
  • Zyxel USG40 Firmware: from 4.20, up to and including 4.72
  • Zyxel USG40W Firmware: from 4.20, up to and including 4.72
  • Zyxel USG60 Firmware: from 4.20, up to and including 4.72
  • Zyxel USG60W Firmware: from 4.20, up to and including 4.72
  • Zyxel Usg 2200-VPN Firmware: from 4.30, up to and including 5.30
  • Zyxel Usg Flex 100w Firmware: from 4.50, up to and including 5.30
  • Zyxel Usg Flex 200 Firmware: from 4.50, up to and including 5.30
  • Zyxel Usg Flex 500 Firmware: from 4.50, up to and including 5.30
  • Zyxel Usg Flex 50w Firmware: from 4.20, up to and including 5.30
  • Zyxel Usg Flex 700 Firmware: from 4.50, up to and including 5.30
  • Zyxel VPN1000 Firmware: from 4.30, up to and including 5.30
  • Zyxel VPN100 Firmware: from 4.30, up to and including 5.30
  • Zyxel VPN300 Firmware: from 4.30, up to and including 5.30
  • Zyxel VPN50 Firmware: from 4.30, up to and including 5.30
  • Zyxel Zywall 1100 Firmware: from 4.30, up to and including 5.30
  • Zyxel Zywall 110 Firmware: from 4.30, up to and including 5.30
  • Zyxel Zywall 310 Firmware: from 4.30, up to and including 5.30

Published 2022-07-19. Last modified 2026-06-17.