Integer overflow in ZyXEL Communications Corp. products - CVE-2023-4398
Published: November 28, 2023
Vulnerability identifier: #VU83521
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2023-4398
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: ZyXEL Communications Corp.
Affected software:
ATP series
USG FLEX series
VPN series
USG FLEX 50W
USG20W-VPN
ATP series
USG FLEX series
VPN series
USG FLEX 50W
USG20W-VPN
Detailed vulnerability description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to integer overflow in the source code of the QuickSec IPSec toolkit used in the VPN feature. A remote attacker can pass specially crafted data to the application, trigger integer overflow and cause a denial of service condition on the target system.
How to mitigate CVE-2023-4398
Install updates from vendor's website.