Format string error in ZyXEL Communications Corp. products - CVE-2023-6764
Published: February 20, 2024
Vulnerability identifier: #VU86619
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2023-6764
CWE-ID: CWE-134
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a format string error in a function of the IPSec VPN feature. A remote attacker can supply a specially crafted input that contains format string specifiers and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
ATP series
USG FLEX series
USG FLEX 50W
USG20W-VPN
USG FLEX series
USG FLEX 50W
USG20W-VPN
How to mitigate CVE-2023-6764
Install updates from vendor's website.
ATP series - update to 5.37 Patch 2
USG FLEX series - update to 5.37 Patch 2
USG FLEX 50W - update to 5.37 Patch 2
USG20W-VPN - update to 5.37 Patch 2
USG FLEX series - update to 5.37 Patch 2
USG FLEX 50W - update to 5.37 Patch 2
USG20W-VPN - update to 5.37 Patch 2