CVE-2024-40891

Exp

**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.

Published: 2025-02-04 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2024-40891 is rated Critical Active Threat (89.2/100): CVSS High severity, with high exploitation likelihood (EPSS 20.48%, 97th percentile). CISA KEV confirms active exploitation (added 2025-02-11) affecting Zyxel / DSL CPE Devices. a weakness (CWE-78) Unauthenticated remote administrative access may be possible. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2024-40891

Name: Zyxel DSL CPE OS Command Injection Vulnerability · CISA KEV detail

Exploit added: 2025-02-11

Action 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.

Exploit prediction scoring system (EPSS) score for CVE-2024-40891

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 53.24% 20.48% -32.76%
2 2026-04-28 56.30% 53.24% -3.06%
3 2026-04-25 — 56.30% —

Full EPSS history (34 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-40891

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.8 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 5.9 [email protected]

Weakness enumeration for CVE-2024-40891

Affected software / configurations for CVE-2024-40891

Vendor Product Version Raw CPE
zyxel vmg1312-b10a_firmware — cpe:2.3:o:zyxel:vmg1312-b10a_firmware:-:*:*:*:*:*:*:*
zyxel vmg1312-b10b_firmware — cpe:2.3:o:zyxel:vmg1312-b10b_firmware:-:*:*:*:*:*:*:*
zyxel vmg1312-b10e_firmware — cpe:2.3:o:zyxel:vmg1312-b10e_firmware:-:*:*:*:*:*:*:*
zyxel vmg3312-b10a_firmware — cpe:2.3:o:zyxel:vmg3312-b10a_firmware:-:*:*:*:*:*:*:*
zyxel vmg3313-b10a_firmware — cpe:2.3:o:zyxel:vmg3313-b10a_firmware:-:*:*:*:*:*:*:*
zyxel vmg3926-b10b_firmware — cpe:2.3:o:zyxel:vmg3926-b10b_firmware:-:*:*:*:*:*:*:*
zyxel vmg4325-b10a_firmware — cpe:2.3:o:zyxel:vmg4325-b10a_firmware:-:*:*:*:*:*:*:*
zyxel vmg4380-b10a_firmware — cpe:2.3:o:zyxel:vmg4380-b10a_firmware:-:*:*:*:*:*:*:*
zyxel vmg8324-b10a_firmware — cpe:2.3:o:zyxel:vmg8324-b10a_firmware:-:*:*:*:*:*:*:*
zyxel vmg8924-b10a_firmware — cpe:2.3:o:zyxel:vmg8924-b10a_firmware:-:*:*:*:*:*:*:*
zyxel sbg3300-n000_firmware — cpe:2.3:o:zyxel:sbg3300-n000_firmware:-:*:*:*:*:*:*:*
zyxel sbg3300-nb00_firmware — cpe:2.3:o:zyxel:sbg3300-nb00_firmware:-:*:*:*:*:*:*:*
zyxel sbg3500-n000_firmware — cpe:2.3:o:zyxel:sbg3500-n000_firmware:-:*:*:*:*:*:*:*
zyxel sbg3500-nb00_firmware — cpe:2.3:o:zyxel:sbg3500-nb00_firmware:-:*:*:*:*:*:*:*

References for CVE-2024-40891

cvelogic Threat Intelligence