---
title: "CVE-2024-11667: Zyxel Multiple Firewalls Path Traversal Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-11667/
description: "CVE-2024-11667 (Zyxel Multiple Firewalls): Exploited in the wild (CISA KEV). A directory traversal vulnerability in the web management interface of Zyxel…"
type: vulnerability-record
section: "Security Digest"
date_published: 2024-11-27
date_modified: 2026-08-05
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-11667"
kev: true
cvss: 7.5
epss: 0.02929
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Zyxel Multiple Firewalls. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2024-12-03, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2024-12-24 ; treat that as the outer limit, not the target. CISA also lists it as known to be used in ransomware campaigns .
- EPSS 2.9% , percentile 87: FIRST’s model estimates a 2.9% chance of exploitation activity in the next 30 days, higher than 87% of all scored CVEs (elevated). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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 (CVE record)

- Zyxel ATP series firmware: versions V5.00 through V5.38
- Zyxel USG FLEX series firmware: versions V5.00 through V5.38
- Zyxel USG FLEX 50(W) series firmware: versions V5.10 through V5.38
- Zyxel USG20(W)-VPN series firmware: versions V5.10 through V5.38

## Severity

- Zyxel CVSS 3.1: 7.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

## Exploitation

- CISA KEV: added 2024-12-03; federal due date 2024-12-24. Known ransomware use: Known.
- CISA required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 2.93% probability of exploitation activity in the next 30 days; percentile 87.

## Sources

- [zyxel.com](https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-protecting-against-recent-firewall-threats-11-27-2024)
- [Listed in CISA KEV notes (zyxel.com)](https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-protecting-against-recent-firewall-threats-11-21-2024)
- [CVE.org record CVE-2024-11667](https://www.cve.org/CVERecord?id=CVE-2024-11667)
- [NVD entry CVE-2024-11667](https://nvd.nist.gov/vuln/detail/CVE-2024-11667)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-11667)

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Source page: https://erroneo.us/security/cve/CVE-2024-11667/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt