Main Vulnerability Database Vulnerabilities #VU83521

Integer overflow in ZyXEL Communications Corp. products - CVE-2023-4398

Published: November 28, 2023

Vulnerability identifier: #VU83521

CSH Severity: Medium

CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-4398

CWE-ID: CWE-190

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to integer overflow in the source code of the QuickSec IPSec toolkit used in the VPN feature. A remote attacker can pass specially crafted data to the application, trigger integer overflow and cause a denial of service condition on the target system.

Affected software

ATP series
USG FLEX series
VPN series
USG FLEX 50W
USG20W-VPN

How to mitigate CVE-2023-4398

Install updates from vendor's website.

ATP series - update to 5.37 Patch 1
USG FLEX series - update to 5.37 Patch 1
USG FLEX 50W - update to 5.37 Patch 1
USG20W-VPN - update to 5.37 Patch 1
VPN series - update to 5.37 Patch 1

External References

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

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