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CISA KEV · ACTIVELY EXPLOITED
HIGH severity

CVE-2024-40890 — Sbg3300-N000 Firmware

HIGH

CVE-2024-40890 is a high-severity (CVSS 8.8) OS Command Injection vulnerability in zyxel sbg3300-n000 firmware. It is in CISA's Known Exploited Vulnerabilities catalog (added 2025-02-11) — treat it as actively exploited and patch now. No vendor fix is recorded yet; mitigation options are listed below.

**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…

Published
Updated
Affected
14 products
Patched
See advisory
Exploits
None indexed
Exploitation data as of Oct 24, 2026 · OSV.dev, NVD, CISA KEV, FIRST.org (EPSS)

Exploitation Status

Actively exploited in the wild

  • Confirmed by CISA's Known Exploited Vulnerabilities catalog on 2025-02-11. Federal agencies were required to remediate by 2025-03-04.
  • A successful exploit gives an attacker total control of the affected component, not partial access.

Exploitation and automatability from CISA (KEV catalog and SSVC triage) for CVE-2024-40890.

EPSS Exploitation Probability

via FIRST.org ↗
20.7%probability of exploitation in next 30 days
Moderate Risk-1.55%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
13.1%26.6%40.0%53.4%45.9%45.9%22.3%20.7%Apr 26Sep 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2024-40890 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 395,249 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

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.

Affected Products

14 products · 14 configurations
OS
sbg3300-n000 firmwarezyxel
all
OS
sbg3300-nb00 firmwarezyxel
all
OS
sbg3500-n000 firmwarezyxel
all
OS
sbg3500-nb00 firmwarezyxel
all
OS
vmg1312-b10a firmwarezyxel
all
OS
vmg1312-b10b firmwarezyxel
all

Detection & mitigation playbook

Vendor / appliance

  1. Detect

    Inventory every zyxel sbg3300-n000 firmware deployment and check each version against the affected-products list above.

  2. Remediation status

    No patch has shipped for CVE-2024-40890 yet — track the zyxel sbg3300-n000 firmware advisory for a fixed release and apply the workarounds below in the meantime.

  3. Mitigate without a patch

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does. Alongside that, restrict the management interface to trusted networks and apply the vendor's recommended configuration mitigations.

Frequently Asked Questions

**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.
O3 Security · Runtime Protection

Is CVE-2024-40890 being exploited in your environment?

Detect and block the exploit chain at execution, on systems you cannot patch yet.

Protect my workloads How runtime protection works
Actively Exploited: CVE-2024-40890: Sbg3300 (High 8.8)