CVE-2024-11667: Zyxel Multiple Firewalls Path Traversal Vulnerability

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: yes — in CISA KEV since 2024-12-03
EPSS: 2.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-27 · updated 2026-08-05
Weakness: CWE-22

Description

A directory traversal vulnerability in the web management interface of Zyxel ATP series firmware versions V5.00 through V5.38, USG FLEX series firmware versions V5.00 through V5.38, USG FLEX 50(W) series firmware versions V5.10 through V5.38, and USG20(W)-VPN series firmware versions V5.10 through V5.38 could allow an attacker to download or upload files via a crafted URL.

Affected products

Zyxel firewall (ZLD): from 5.00 through 5.38; from 5.10 through 5.38

References

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-protecting-against-recent-firewall-threats-11-27-2024
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-11667

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