CVE-2023-6398: Zyxel ATP100 Firmware

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 through 5.37 Patch 1, USG FLEX 50(W) series firmware versions from 4.16 through 5.37 Patch 1, USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1, USG FLEX H series firmware versions from 1.10 through 1.10 Patch 1, NWA50AX firmware versions through 6.29(ABYW.3), WAC500 firmware versions through 6.65(ABVS.1), WAX300H firmware versions through 6.60(ACHF.1), and WBE660S firmware versions through 6.65(ACGG.1) could allow an authenticated attacker with administrator privileges to execute some operating system (OS) commands on an affected device via FTP.

Affected products

  • Zyxel ATP100 Firmware: from 4.32, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel ATP100W Firmware: from 4.32, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel ATP200 Firmware: from 4.32, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel ATP500 Firmware: from 4.32, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel ATP700 Firmware: from 4.32, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel ATP800 Firmware: from 4.32, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel NWA110AX Firmware: before 6.70\(abtg.2\) (fixed in 6.70\(abtg.2\))
  • Zyxel NWA1123ACV3 Firmware: before 6.70\(abvt.1\) (fixed in 6.70\(abvt.1\))
  • Zyxel NWA210AX Firmware: before 6.70\(abtd.2\) (fixed in 6.70\(abtd.2\))
  • Zyxel NWA220AX-6e Firmware: before 6.70\(acco.1\) (fixed in 6.70\(acco.1\))
  • Zyxel NWA50AX-Pro Firmware: before 6.80\(acge.0\) (fixed in 6.80\(acge.0\))
  • Zyxel NWA50AX Firmware: before 6.29\(abyw.4\) (fixed in 6.29\(abyw.4\))
  • Zyxel NWA55AXE Firmware: before 6.29\(abzl.4\) (fixed in 6.29\(abzl.4\))
  • Zyxel NWA90AX-Pro Firmware: before 6.80\(acgf.0\) (fixed in 6.80\(acgf.0\))
  • Zyxel NWA90AX Firmware: before 6.29\(accv.4\) (fixed in 6.29\(accv.4\))
  • Zyxel Uos: version 1.10 only
  • Zyxel USG20-VPN Firmware: from 4.16, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel USG20W-VPN Firmware: from 4.16, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel Usg Flex 100 Firmware: from 4.50, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel Usg Flex 100ax Firmware: from 4.50, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel Usg Flex 100h Firmware: from 4.50, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel Usg Flex 100w Firmware: from 4.50, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel Usg Flex 200 Firmware: from 4.50, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel Usg Flex 200h Firmware: from 4.50, before 5.37 (fixed in 5.37); version 5.37 only
  • Zyxel Usg Flex 200hp Firmware: from 4.50, before 5.37 (fixed in 5.37); version 5.37 only
  • and 17 more

Published 2024-02-20. Last modified 2026-06-17.