Vulnerability · CVE-2024-11667
Zyxel Multiple Firewalls Path Traversal Vulnerability
Published Nov 21, 2024 · corrected/updated Aug 4, 2026 · Zyxel Multiple Firewalls · evidence confidence very high
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.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2024-11667 is a critical public vulnerability record for Zyxel Multiple Firewalls. CISA lists it as known exploited. Published remediation guidance: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether Zyxel Multiple Firewalls is in your estate, then compare installed versions with the affected ranges. Affected packages or ranges on record: zyxel/zld; Zyxel Multiple Firewalls. Published remediation guidance: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: CVSS 9.8, EPSS 2.9%. CISA lists it as known exploited. Weakness classes: CWE-22. Sources contributing to this record: cisa_kev, cve_org, epss, nvd. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Confirmed in CISA KEV since Nov 21, 2024. Listed in CISA KEV and VulnCheck KEV.
Patch and remediation
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable. CISA due date Dec 24, 2024.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Nov 27, 2024 · Catalog
Detected
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.
Dec 3, 2024 · CISA KEV
Known exploited
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Dec 24, 2024 · CISA KEV
Remediation due
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Aug 4, 2026 · Catalog
Updated
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
- cpe zyxel/zldversion unspecified
- vendor Zyxel Multiple Firewallsversion unspecified
Sources
- CISA KEVConfirmed exploitationCVE-2024-11667
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.
cisa.gov - CVE.orgVulnerability recordCVE-2024-11667
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2024-11667
30-day exploitation probability 2.9%
first.org - NIST NVDVulnerability recordCVE-2024-11667
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 vers
nvd.nist.gov - VulnCheck KEVConfirmed exploitationCVE-2024-11667
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.
vulncheck.com