Vulnerability identifier: #VU83594

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-35137

CWE-ID: CWE-287

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
NAS326
Hardware solutions / Routers for home users
NAS542
Hardware solutions / Routers for home users

Vendor: ZyXEL Communications Corp.

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests in the authentication module. A remote attacker can send a specially crafted URL to the target device and obtain system information.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

NAS326: 5.21(AAZF.14)C0

NAS542: 5.21(ABAG.11)C0

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External links
http://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-authentication-bypass-and-command-injection-vulnerabilities-in-nas-products

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.