CVE-2024-11667Known exploitationNetwork attack vector

Unauthenticated file read and upload via path traversal

Published Nov 27, 2024 · Updated Aug 5, 2026

Path traversal in Zyxel ZLD firewall firmware 5.00 through 5.38 allows remote attackers to download or upload files via crafted URLs. The web management interface fails to confine crafted URL paths to an intended directory; Zyxel has not disclosed the responsible handler. The interface must be network-reachable, and successful requests expose or place files on the firewall without authentication or user interaction.

CVSS severity7.5
High
EPSS probability2.93%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Zyxel ZLD firewall firmware 5.00 through 5.38 allows remote attackers to download or upload files via crafted URLs. The web management interface fails to confine crafted URL paths to an intended directory; Zyxel has not disclosed the responsible handler. The interface must be network-reachable, and successful requests expose or place files on the firewall without authentication or user interaction.

The record

CVE
CVE-2024-11667
Published
Nov 27, 2024
Updated
Aug 5, 2026
Vendor
Zyxel Networks
Product
Zyxel USG FLEX 50W Firmware
Classifications
CWE-22, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 27, 2024CVE publishedPublication date reported by the CVE source.
  2. Dec 3, 2024Exploitation reportedCISA Known Exploited Vulnerabilities catalog entry
  3. Aug 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.10 <5.38

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Zyxel Networks · Zyxel USG FLEX 50W Firmwareversion=5.10 <5.38
Zyxel Networks · USG20(W)-VPN Seriesversion=versions V5.10 through V5.38
Zyxel Networks · USG FLEX 50 Seriesversion=versions V5.10 through V5.38
Zyxel Networks · Zyxel ATP Series Firmwareversion=5.00 <=5.38
Zyxel Networks · ATP Seriesversion=versions V5.00 through V5.38
Zyxel Networks · Zyxel USG FLEX Series Firmwareversion=5.00 <=5.38
Zyxel Networks · USG FLEX Seriesversion=versions V5.00 through V5.38
Zyxel Networks · Zyxel USG20-VPN Firmwareversion=5.10 <=5.38

Published CVSS scores

7.5Zyxel CorporationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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