CVE-2022-0734: Zyxel ATP100 Firmware

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 firmware versions 4.35 through 5.20, and VPN series firmware versions 4.35 through 5.20, that could allow an attacker to obtain some information stored in the user's browser, such as cookies or session tokens, via a malicious script.

Affected products

  • Zyxel ATP100 Firmware: from 4.35, up to and including 5.20
  • Zyxel ATP100W Firmware: from 4.35, up to and including 5.20
  • Zyxel ATP200 Firmware: from 4.35, up to and including 5.20
  • Zyxel ATP500 Firmware: from 4.35, up to and including 5.20
  • Zyxel ATP700 Firmware: from 4.35, up to and including 5.20
  • Zyxel ATP800 Firmware: from 4.35, up to and including 5.20
  • Zyxel USG200 Firmware: from 4.35, up to and including 4.70
  • Zyxel USG20 Firmware: from 4.35, up to and including 4.70
  • Zyxel USG210 Firmware: from 4.35, up to and including 4.70
  • Zyxel USG2200 Firmware: from 4.35, up to and including 4.70
  • Zyxel USG300 Firmware: from 4.35, up to and including 4.70
  • Zyxel USG310 Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 1100 Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 110 Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 1900 Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 20w-VPN Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 20w Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 2200-VPN Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 310 Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 40 Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 40w Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 60 Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg 60w Firmware: from 4.35, up to and including 4.70
  • Zyxel Usg Flex 100 Firmware: from 4.50, up to and including 5.20
  • Zyxel Usg Flex 100w Firmware: from 4.50, up to and including 5.20
  • and 7 more

Published 2022-05-24. Last modified 2026-06-17.