CVE-2023-4398

28.11.2023, 02:15

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	Primary	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Affected Products (NVD)

Vendor	Product	Version
zyxel	zld	4.32 ≤ 𝑥 ≤ 5.37
zyxel	zld	4.50 ≤ 𝑥 ≤ 5.37
zyxel	zld	4.16 ≤ 𝑥 ≤ 5.37
zyxel	zld	4.30 ≤ 𝑥 ≤ 5.37

𝑥

= Vulnerable software versions

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
zyxel	atp_firmware	4.32 ≤ 𝑥 ≤ 5.37	ADP
zyxel	usg_flex_firmware	4.50 ≤ 𝑥 ≤ 5.37	ADP
zyxel	usg_flex_50w_firmware	4.16 ≤ 𝑥 ≤ 5.37	ADP
zyxel	usg20w-vpn_firmware	4.16 ≤ 𝑥 ≤ 5.37	ADP
zyxel	vpn_firmware	5.30 ≤ 𝑥 ≤ 5.37	ADP

Common Weakness Enumeration

CWE-190 - Integer Overflow or Wraparound
The software 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 can introduce other weaknesses when the calculation is used for resource management or execution control.

References

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