CVE-2023-4398

Published: Nov 28, 2023Modified: Jun 17, 2026

7.5

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 3.9 / Impact: 3.6

Source: NVD

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.

Affected (4)

Products: Zyxel: Zld

Zyxel

1 product

Zld

Configuration A

1 vulnerable · 6 platform

Vulnerable Software	Affected Versions
Zyxel Zld	4.32 ≤ version ≤ 5.37

Running on/with	Platform Versions
Zyxel Atp100	All versions
Zyxel Atp100w	All versions
Zyxel Atp200	All versions
Zyxel Atp500	All versions
Zyxel Atp700	All versions
Zyxel Atp800	All versions

Configuration B

1 vulnerable · 7 platform

Vulnerable Software	Affected Versions
Zyxel Zld	4.50 ≤ version ≤ 5.37

Running on/with	Platform Versions
Zyxel Usg Flex 100	All versions
Zyxel Usg Flex 100w	All versions
Zyxel Usg Flex 200	All versions
Zyxel Usg Flex 50	All versions
Zyxel Usg Flex 500	All versions
Zyxel Usg Flex 50w	All versions
Zyxel Usg Flex 700	All versions

Configuration C

1 vulnerable · 2 platform

Vulnerable Software	Affected Versions
Zyxel Zld	4.16 ≤ version ≤ 5.37

Running on/with	Platform Versions
Zyxel Usg 20w Vpn	All versions
Zyxel Vpn50w	All versions

Configuration D

1 vulnerable · 4 platform

Vulnerable Software	Affected Versions
Zyxel Zld	4.30 ≤ version ≤ 5.37

Running on/with	Platform Versions
Zyxel Vpn100	All versions
Zyxel Vpn1000	All versions
Zyxel Vpn300	All versions
Zyxel Vpn50	All versions

Related CWEs

CWE-190

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

References (2)

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

Source: security@zyxel.com.tw

Vendor Advisory

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

Source: af854a3a-2127-422b-91ae-364da2661108

Vendor Advisory

Timeline

No history available yet.