---
title: "CVE-2024-40890: Zyxel DSL CPE OS Command Injection Vulnerability"
url: https://erroneo.us/security/cve/CVE-2024-40890/
description: "CVE-2024-40890 (Zyxel DSL CPE Devices): Exploited in the wild (CISA KEV). UNSUPPORTED WHEN ASSIGNED A post-authentication command injection vulnerability in…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-02-04
date_modified: 2025-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2024-40890"
kev: true
cvss: 8.8
epss: 0.20703
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Zyxel DSL CPE Devices. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2025-02-11, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2025-03-04 ; treat that as the outer limit, not the target.
- EPSS 20.7% , percentile 98: FIRST’s model estimates a 20.7% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.

## What it is

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)C020170615 could allow an authenticated attacker to execute operating system (OS) commands on an affected device by sending a crafted HTTP POST request.

## Affected products (CVE record)

- Zyxel VMG4325-B10A firmware: <= 1.00(AAFR.4)C0_20170615

## Severity

- Zyxel CVSS 3.1: 8.8 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: added 2025-02-11; federal due date 2025-03-04. Known ransomware use: Unknown.
- CISA 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 SSVC assessment: exploitation active , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 20.70% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [zyxel.com](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)
- [Listed in CISA KEV notes (zyxel.com)](https://www.zyxel.com/service-provider/global/en/security-advisories/zyxel-security-advisory-command-injection-insecure-in-certain-legacy-dsl-cpe-02-04-2025)
- [CVE.org record CVE-2024-40890](https://www.cve.org/CVERecord?id=CVE-2024-40890)
- [NVD entry CVE-2024-40890](https://nvd.nist.gov/vuln/detail/CVE-2024-40890)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-40890)

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Source page: https://erroneo.us/security/cve/CVE-2024-40890/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt