Description
A format string vulnerability in a function of the IPSec VPN feature 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, and USG20(W)-VPN series firmware versions from 4.16 through 5.37 Patch 1 could allow an attacker to achieve unauthorized remote code execution by sending a sequence of specially crafted payloads containing an invalid pointer; however, such an attack would require detailed knowledge of an affected device’s memory layout and configuration.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected products
- Zyxel / ATP series firmwareversion 4.32 through 5.37 Patch 1 – version 4.32 through 5.37 Patch 1
- Zyxel / USG20(W)-VPN series firmwareversion 4.16 through 5.37 Patch 1 – version 4.16 through 5.37 Patch 1
- Zyxel / USG FLEX 50(W) series firmwareversion 4.16 through 5.37 Patch 1 – version 4.16 through 5.37 Patch 1
- Zyxel / USG FLEX series firmwareversion 4.50 through 5.37 Patch 1 – version 4.50 through 5.37 Patch 1