Description
A command injection vulnerability in the IPSec VPN feature of Zyxel ATP series firmware versions from V4.32 through V5.38, USG FLEX series firmware versions from V4.50 through V5.38, USG FLEX 50(W) series firmware versions from V4.16 through V5.38, and USG20(W)-VPN series firmware versions from V4.16 through V5.38 could allow an unauthenticated attacker to execute some OS commands on an affected device by sending a crafted username to the vulnerable device. Note that this attack could be successful only if the device was configured in User-Based-PSK authentication mode and a valid user with a long username exceeding 28 characters exists.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Zyxel ATP series firmware
Default version status: unaffected
versions V4.32 through V5.38affected
Zyxel USG FLEX series firmware
Default version status: unaffected
versions V4.50 through V5.38affected
Zyxel USG FLEX 50(W) series firmware
Default version status: unaffected
versions V4.16 through V5.38affected
Zyxel USG20(W)-VPN series firmware
Default version status: unaffected
versions V4.16 through V5.38affected