How severe is CVE-2024-40890?

CVE-2024-40890 has a CVSS 3.1 base score of 8.8 (HIGH). EPSS estimates a 20.7% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2024-40890: Zyxel DSL CPE OS Command Injection Vulnerability

CISA Known Exploited Vulnerabilities

Zyxel DSL CPE OS Command Injection Vulnerability is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2025-02-11

Remediation due

2025-03-04

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.

CISA notes
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025 ; https://www.zyxel.com/service-provider/global/en/security-advisories/zyxel-security-advisory-command-injection-insecure-in-certain-legacy-dsl-cpe-02-04-2025 ; https://nvd.nist.gov/vuln/detail/CVE-2024-40890

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.

Severity

CVSS 3.1 · CNA8.8 HIGH

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

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Exploitation Context

as of October 15, 2026

All KEV statistics→

CISA added CVE-2024-40890 to the KEV catalog 7 days after its CVE record was published. The median for entries added in 2025 is 26 days.
It is one of 13 Zyxel entries in the CISA KEV catalog, and one of 2 added in 2025.
Its current EPSS score (20.7%) is higher than that of 35% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Zyxel	Zyxel VMG4325-B10A firmware	<= 1.00(AAFR.4)C0_20170615

References

1 Links

Vendor advisories

https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025

Record Details

Published

2025-02-04

Last updated

2025-10-21

Assigner (CNA)

Zyxel

Credited to

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Tool categories

Application Security Tools Penetration Testing Tools

CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.

CVE-2024-40890