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

Vulnerability summary

CVE-2024-11667 is a critical (CVSS 9.8) Path Traversal vulnerability in Zyxel Multiple Firewalls. It is known to be exploited: CISA lists it, first on 03-12-2024. It has been used in ransomware campaigns. EPSS estimates a 2.93% chance of exploitation in the next 30 days, higher than 86.8% of scored vulnerabilities.

Timeline

1. 27-11-2024
   PublishedVulnerability first disclosed.
2. 03-12-2024
   Added to CISA KEVZyxel Multiple Firewalls Path Traversal Vulnerability
3. 24-12-2024
   CISA remediation dueApply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
4. 05-08-2026
   Last modifiedVulnerability information updated.

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.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.