Zyxel Multiple Firewalls Path Traversal Vulnerability

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2024-12-03
• Known to be used in ransomware campaigns
• Critical severity: CVSS 9.8

[ Description ]Official 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.

CISA: Multiple Zyxel firewalls contain a path traversal vulnerability in the web management interface that could allow an attacker to download or upload files via a crafted URL.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 24 Dec 2024): Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-protecting-…Vendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource