Which products and versions are affected by CVE-2024-11667?

Affected: Zld (Zyxel); ATP series firmware versions >= versions V5.00 through V5.38; USG20(W)-VPN series firmware versions >= versions V5.10 through V5.38, among others. The full list is in the CVE brief.

Is CVE-2024-11667 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 21, 2024 and is known to be used in ransomware campaigns.

Is CVE-2024-11667 in the CISA KEV catalog?

Yes. It was added on Dec 3, 2024 with a federal remediation due date of Dec 24, 2024.

Is there a public exploit for CVE-2024-11667?

Public exploit code is available.

Is there a fix for CVE-2024-11667?

Fixed versions are available, including Zld <=5.38, Zld 5.38.

How urgently should CVE-2024-11667 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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Vulnerability Intelligence

CVE-2024-11667

Q: How urgently should CVE-2024-11667 be patched?

Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CriticalExploitedPublic exploit

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…

Published Nov 27, 2024 · Updated Aug 5, 2026

Key Facts

Patch immediately

CVE-2024-11667 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Zld (Zyxel), ATP series firmware, USG20(W)-VPN series firmware and 2 more products.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 21, 2024 and is known to be used in ransomware campaigns. Public exploit code is available.
EPSS estimates a 2.9% probability of exploitation in the next 30 days.
Fixed versions are available, including Zld <=5.38, Zld 5.38.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

9.8

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

EPSS (30-day exploit likelihood)

2.9%

Higher than 86.8% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings, used by ransomware

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2024-11667 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Known-Exploited Catalog Listings

Catalog	Added	Remediation due	Ransomware use
CISA KEV	Dec 3, 2024	Dec 24, 2024	Known
Industry KEV feed	Nov 21, 2024	Dec 24, 2024	Known
CIRCL KEV	Dec 3, 2024	Dec 24, 2024	Known
ENISA EUVD	Dec 3, 2024	n/a	Not reported

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

Affected Products

5 affected entries in total

Product	Affected versions	Fixed in
ZldZyxel	See advisory	5.38
ATP series firmware	>= versions V5.00 through V5.38	n/a
USG20(W)-VPN series firmware	>= versions V5.10 through V5.38	n/a
USG FLEX 50(W) series firmware	>= versions V5.10 through V5.38	n/a
USG FLEX series firmware	>= versions V5.00 through V5.38	n/a

Patched Releases

Zld

<=5.38

Timeline

Added to Industry KEV feed
Nov 21, 2024
Publicly disclosed
Nov 27, 2024
Added to CISA KEV
Dec 3, 2024
Added to CIRCL KEV
Dec 3, 2024
Added to ENISA EUVD
Dec 3, 2024
Last updated
Aug 5, 2026

Weakness Type

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

References

FAQ

Common Questions.

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…
Affected: Zld (Zyxel); ATP series firmware versions >= versions V5.00 through V5.38; USG20(W)-VPN series firmware versions >= versions V5.10 through V5.38, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Nov 21, 2024 and is known to be used in ransomware campaigns.
Yes. It was added on Dec 3, 2024 with a federal remediation due date of Dec 24, 2024.
Public exploit code is available.
Fixed versions are available, including Zld <=5.38, Zld 5.38.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

Is CVE-2024-11667 Running On Your Attack Surface?

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