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CVE-2024-40891

KEVZyxel DSL CPE OS Command Injection Vulnerability
Description

Multiple Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in the management commands that could allow an authenticated attacker to execute OS commands via Telnet.

**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.

CVSS 3.1 vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
PublishedFeb 4, 2025
Last modifiedJun 17, 2026
Added to KEVFeb 11, 2025
Remediation dueMar 4, 2025
References
0 recent articles mention this CVE
    76
    Risk assessment · High

    Actively exploited. Patch immediately.

    Exploitation
    Confirmed in the wild (CISA KEV)
    Federal remediation deadline
    Overdue by 602 days
    CVSS
    8.8 HIGH
    EPSS (30-day exploit probability)
    22.9% · top 2% of all CVEs
    Weakness
    CWE-78
    Attack vector
    Network, remotely reachable
    Recommended actions
    1. 1.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.
    2. 2.Treat as emergency change: patch or isolate internet-facing instances first.
    3. 3.Review exposure: confirm which instances are reachable from the internet and restrict access until patched.
    4. 4.Hunt for compromise: review logs for the disclosure window, not just from the patch date.

    Assessment is derived automatically from the live signals above; verify against your own asset inventory.