CVE-2023-4398: Integer Overflow
An integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of the Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, USG20(W)-VPN series firmware versions 4.16 through 5.37, and VPN series firmware versions 4.30 through 5.37, could allow an unauthenticated attacker to cause denial-of-service (DoS) conditions on an affected device by sending a crafted IKE packet.
Affected Software
Event History
Frequently Asked Questions
What is CVE-2023-4398?
CVE-2023-4398 is an integer overflow vulnerability in the source code of the QuickSec IPSec toolkit used in the VPN feature of certain Zyxel ATP series firmware versions.
Which Zyxel products are affected by CVE-2023-4398?
Zyxel ATP series firmware versions 4.32 through 5.37, USG FLEX series firmware versions 4.50 through 5.37, USG FLEX 50(W) series firmware versions 4.16 through 5.37, and USG20(W)-VPN series firmware versions are affected.
What is the severity of CVE-2023-4398?
CVE-2023-4398 has a severity rating of 7.5 (high).
How can I fix CVE-2023-4398?
To fix CVE-2023-4398, update the firmware of the affected Zyxel products to versions 5.37 (for ATP series), 5.37 (for USG FLEX series), or 5.37 (for USG FLEX 50(W) series).
Where can I find more information about CVE-2023-4398?
You can find more information about CVE-2023-4398 in the Zyxel Security Advisory for Multiple Vulnerabilities in Firewalls and APs.