Which products and versions are affected by CVE-2024-40891?

Affected: Sbg3300-N000 Firmware (Zyxel); Sbg3300-Nb00 Firmware (Zyxel); Sbg3500-N000 Firmware (Zyxel), among others. The full list is in the CVE brief.

Is CVE-2024-40891 being exploited in the wild?

It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 28, 2025.

Is CVE-2024-40891 in the CISA KEV catalog?

Yes. It was added on Feb 11, 2025 with a federal remediation due date of Mar 4, 2025.

Is there a public exploit for CVE-2024-40891?

Public exploit code is available.

Is there a fix for CVE-2024-40891?

No fixed version is listed yet; check the vendor advisory for mitigations.

How urgently should CVE-2024-40891 be patched?

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

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Vulnerability Intelligence

CVE-2024-40891

HighExploitedPublic exploit

UNSUPPORTED WHEN ASSIGNED A post-authentication command injection vulnerability in the management commands of the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an authenticated attacker to execute operating system (OS) commands on an…

Published Feb 4, 2025 · Updated Oct 27, 2025

Key Facts

Patch immediately

CVE-2024-40891 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Sbg3300-N000 Firmware (Zyxel), Sbg3300-Nb00 Firmware (Zyxel), Sbg3500-N000 Firmware (Zyxel) and 11 more products.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 28, 2025. Public exploit code is available.
EPSS estimates a 22% probability of exploitation in the next 30 days.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

CVSS v3.1

8.8

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

EPSS (30-day exploit likelihood)

22%

Higher than 97.6% of all scored CVEs

Exploited in the wild

Yes

4 catalog listings

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2024-40891 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	Feb 11, 2025	Mar 4, 2025	Not reported
Industry KEV feed	Jan 28, 2025	Mar 4, 2025	Not reported
CIRCL KEV	Feb 11, 2025	Mar 4, 2025	Not reported
ENISA EUVD	Feb 11, 2025	n/a	Not reported

Required action: The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization if a current mitigation is unavailable.

Affected Products

15 affected entries in total

Product	Affected versions	Fixed in
Sbg3300-N000 FirmwareZyxel	See advisory	n/a
Sbg3300-Nb00 FirmwareZyxel	See advisory	n/a
Sbg3500-N000 FirmwareZyxel	See advisory	n/a
Sbg3500-Nb00 FirmwareZyxel	See advisory	n/a
Vmg1312-B10a FirmwareZyxel	See advisory	n/a

9 more affected products in the full CVE brief

Timeline

Added to Industry KEV feed
Jan 28, 2025
Publicly disclosed
Feb 4, 2025
Added to CISA KEV
Feb 11, 2025
Added to CIRCL KEV
Feb 11, 2025
Added to ENISA EUVD
Feb 11, 2025
Last updated
Oct 27, 2025

Weakness Type

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

References

FAQ

Common Questions.

UNSUPPORTED WHEN ASSIGNED A post-authentication command injection vulnerability in the management commands of the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an authenticated attacker to execute operating system (OS) commands on an affected device via Telnet.
Affected: Sbg3300-N000 Firmware (Zyxel); Sbg3300-Nb00 Firmware (Zyxel); Sbg3500-N000 Firmware (Zyxel), 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 Jan 28, 2025.
Yes. It was added on Feb 11, 2025 with a federal remediation due date of Mar 4, 2025.
Public exploit code is available.
No fixed version is listed yet; check the vendor advisory for mitigations.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.

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