Vulnerability · Published Apr 24, 2023 · Assigned by Zyxel

CVE-2023-22916

High 8.1

In plain English

A high-severity improper input validation in ATP series firmware from Zyxel. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)8.1High

Exploit odds (30 days)0.7%top 46.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

The configuration parser of Zyxel ATP series firmware versions 5.10 through 5.35, USG FLEX series firmware versions 5.00 through 5.35, USG FLEX 50(W) firmware versions 5.10 through 5.35, USG20(W)-VPN firmware versions 5.10 through 5.35, and VPN series firmware versions 5.00 through 5.35, which fails to properly sanitize user input. A remote unauthenticated attacker could leverage the vulnerability to modify device configuration data, resulting in DoS conditions on an affected device if the attacker could trick an authorized administrator to switch the management mode to the cloud mode.

Affected products (as reported)

Vendor	Product	Versions
Zyxel	ATP series firmware	5.10 through 5.35
Zyxel	USG FLEX series firmware	5.00 through 5.35
Zyxel	USG FLEX 50(W) firmware	5.10 through 5.35
Zyxel	USG20(W)-VPN firmware	5.10 through 5.35
Zyxel	VPN series firmware	5.00 through 5.35

Weakness: CWE-20 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H

References

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