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CVE-2024-40890

Zyxel DSL CPE OS Command Injection

8.8 HIGHActively exploited (CISA KEV)EPSS 20.7%
  1. Published4 Feb 2025
  2. Added to CISA KEV11 Feb 2025
  3. Remediation due4 Mar 2025
Actively exploited (CISA KEV)

Multiple Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in the CGI program that could allow an authenticated attacker to execute OS commands via a crafted HTTP request.

Added to KEV: 11 Feb 2025Federal remediation due: 4 Mar 2025

Description

**UNSUPPORTED WHEN ASSIGNED** A post-authentication command injection vulnerability in the CGI program 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 by sending a crafted HTTP POST request.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

Zyxel Sbg3300-n000 Firmwareall versions
Zyxel Sbg3300-nb00 Firmwareall versions
Zyxel Sbg3500-nb00 Firmwareall versions
Zyxel Vmg1312-b10a Firmwareall versions
Zyxel Vmg1312-b10b Firmwareall versions
Zyxel Vmg1312-b10e Firmwareall versions
Zyxel Vmg3312-b10a Firmwareall versions
Zyxel Vmg3313-b10a Firmwareall versions
Zyxel Vmg3926-b10b Firmwareall versions
Zyxel Vmg4325-b10a Firmwareall versions
Zyxel Vmg4380-b10a Firmwareall versions
Zyxel Vmg8324-b10a Firmwareall versions
Zyxel Vmg8924-b10a Firmwareall versions

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2024-40890 being actively exploited?

Yes. CVE-2024-40890 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 11 Feb 2025.

How severe is CVE-2024-40890?

CVE-2024-40890 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 20.7% probability of exploitation.

Which products are affected by CVE-2024-40890?

Affected products include Zyxel Sbg3300-n000 Firmware, Zyxel Sbg3300-nb00 Firmware, Zyxel Sbg3500-nb00 Firmware, Zyxel Vmg1312-b10a Firmware, Zyxel Vmg1312-b10b Firmware, and 8 more.

How do I fix CVE-2024-40890?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-40890 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.