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Zyxel Hardcoded Vulnerability Threat Intel Advisory

CloudSEK threat intelligence advisory on Zyxel vulnerability tracked as CVE-2020-29583 found in Zyxel firewalls and AccessPoint controllers.
Updated on
February 17, 2026
Published on
January 8, 2021
Read MINUTES
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Advisory
 Vulnerability Intelligence
CVE
 CVE-2020-29583
Platform
 Zyxel Networking Devices [Firewall/AP Controllers]
  A hardcoded credential vulnerability was discovered in Zyxel firewalls and AccessPoint controllers. The vulnerability targets the user account “zyfwp,” designed to deliver firmware updates to connected access points via FTP.

Affected Products

Firewall Series
Vulnerable Firmware 
ATP series ZLD V4.60
USG series ZLD V4.60
USG FLEX  ZLD V4.60
VPN series ZLD V4.60
 
AP Controllers
Vulnerable Firmware
NXC2500  V6.00 - V6.10
NXC5500 V6.00 -V6.10
 

Impact

  • Hardcoded credential provides attackers backdoor access to SSH and web admin interfaces of the affected devices.
  • Unauthorized access to networking devices can lead to host discovery on target network and unauthorized changes to network settings.
  • Attackers can use the above mentioned enumerated information to carry out attacks against other hosts on the network.
 

Mitigation

For affected firewall products a patch was released in the following update:
  • ZLD V4.60 Patch1 in Dec. 2020
For affected AP Controller products a patch is available in an upcoming update:
  • V6.10 Patch1 on Jan. 8, 2021
CloudSEK Platform is a no-code platform that powers our products with predictive threat analytic capabilities.
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