How severe is CVE-2024-40891?

CVE-2024-40891 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2024-40891 being actively exploited?

Yes. CVE-2024-40891 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-02-11, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2024-40891?

CVE-2024-40891 primarily affects Zyxel Vmg1312-b10a Firmware. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2024-40891?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2024-40891 have an EU (EUVD) identifier?

Yes. CVE-2024-40891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38851. It is also flagged as exploited in the EUVD (since 2025-02-11).

When was CVE-2024-40891 published?

CVE-2024-40891 was published on 2025-02-04 and last updated on 2026-06-17.

CVE-2024-40891

CVE-2024-40891 is a high-severity vulnerability in Zyxel Vmg1312-b10a Firmware with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2025-02-11). The underlying weakness is classified as CWE-78.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 22% (97th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2025-02-11)
EU (EUVD) id: EUVD-2024-38851
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2025-02-11)
Weakness: CWE-78
Affected product: Zyxel Vmg1312-b10a Firmware
Published: 2025-02-04
Last modified: 2026-06-17

Description

**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.

Frequently asked questions

What is CVE-2024-40891?: **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.
How severe is CVE-2024-40891?: CVE-2024-40891 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2024-40891 being actively exploited?: Yes. CVE-2024-40891 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2025-02-11, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2024-40891?: CVE-2024-40891 primarily affects Zyxel Vmg1312-b10a Firmware. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2024-40891?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2024-40891 have an EU (EUVD) identifier?: Yes. CVE-2024-40891 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2024-38851. It is also flagged as exploited in the EUVD (since 2025-02-11).
When was CVE-2024-40891 published?: CVE-2024-40891 was published on 2025-02-04 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:o:zyxel:vmg1312-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg1312-b10b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg1312-b10e_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3312-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3313-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg3926-b10b_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4325-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg4380-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8324-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:vmg8924-b10a_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:sbg3300-n000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:sbg3300-nb00_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:sbg3500-n000_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:zyxel:sbg3500-nb00_firmware:-:*:*:*:*:*:*:*

More vulnerabilities in Zyxel Vmg1312-b10a Firmware

CVE-2025-0890 — Critical (CVSS 9.8): **UNSUPPORTED WHEN ASSIGNED** Insecure default credentials for the Telnet function in the legacy DSL CPE Zyxel…
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