CVE-2023-4398

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Zyxel Zld

PublishedNov 28, 2023

First seenNov 28, 2023

Weakness typeCWE-190Integer overflow

How to fix

Vendor advisories

zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-multiple-vulnerabilities-in-firewalls-and-aps

Affected products

Product	Affected versions	Fixed in
zyxel zld	4.32 ≤ v ≤ 5.37, 4.50 ≤ v ≤ 5.37, 4.16 ≤ v ≤ 5.37, 4.30 ≤ v ≤ 5.37	—

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