CISA KEV · Known exploitedCritical

CVE-2024-11667

Zyxel Multiple Firewalls

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.

CVSS: 9.8
EPSS: 3.02%
CISA KEV: Listed
Published: 2024.11.27

PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV

Exploit probability3.02%

Technical severityCVSS 9.8

Vulnerability overview

Affected product and versions

Product: Zyxel Multiple Firewalls
Affected versions: versions V5.00 through V5.38, versions V5.10 through V5.38, 5.00, 5.10, >= 5.00 <= 5.38, >= 5.10 <= 5.38
Fixed versions: No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due date: 2024.12.24

1
Identify
Confirm that Zyxel Multiple Firewalls and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-22
KEV added: 2024.12.03
Ransomware use: 확인됨