CVE-2023-4398 Integer overflow in ATP series firmware

High 7.5 Published 28 Nov 2023 Updated 17 Oct 2024

An unauthenticated attacker can cause denial-of-service on Zyxel firewalls by sending a crafted IKE packet due to an integer overflow in the IPSec toolkit.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-4398?

CVE-2023-4398 is a high-severity vulnerability in Zyxel ATP series firmware, published on 28 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-190

Which versions are affected by CVE-2023-4398?

It affects 1 product.

Products include Zyxel Zld.

How do I fix CVE-2023-4398?

No fix has been published for CVE-2023-4398 yet. Limit exposure of the affected software until one is available.

Is CVE-2023-4398 being exploited?

There is no known exploitation of CVE-2023-4398 in the wild and no public exploit code.

Sources

Also known as GHSA-rfqw-q592-fp2h.