Vulnerability · Published Nov 28, 2023 · Assigned by Zyxel

CVE-2023-35136

Medium 5.5

In plain English

A medium-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 0.2% (higher than 16% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.2%top 84.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

An improper input validation vulnerability in the “Quagga” package 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 authenticated local attacker to access configuration files on an affected device.

Affected products (as reported)

Vendor	Product	Versions
Zyxel	ATP series firmware	versions 4.32 through 5.37
Zyxel	USG FLEX series firmware	versions 4.50 through 5.37
Zyxel	USG FLEX 50(W) series firmware	versions 4.16 through 5.37
Zyxel	USG20(W)-VPN series firmware	versions 4.16 through 5.37
Zyxel	VPN series firmware	versions 4.30 through 5.37

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

References

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