Information disclosure in ZyXEL Communications Corp. products - CVE-2023-35136

Vulnerability identifier: #VU83516

CSH Severity: Low

CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2023-35136

CWE-ID: CWE-200

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to gain access to potentially sensitive information.

The vulnerability exists due to improper input validation in the "Quagga" package. A local user can gain unauthorized access to configuration files on the target device.

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

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

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

• Multiple vulnerabilities in Zyxel firewalls and APs