What is the CVSS score of CVE-2025-0890?

CVE-2025-0890 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 23.8%.

Which versions of Vmg4325 B10A Firmware are affected by CVE-2025-0890?

Organizations using the legacy DSL CPE Zyxel VMG4325-B10A firmware face critical risk from CVE-2025-0890, a improper authentication vulnerability rated CVSS 9.8.

How to fix or mitigate CVE-2025-0890?

Within 24 hours: Identify all affected systems running the legacy DSL CPE Zyxel VMG4325-B10A firmware and apply vendor patches immediately. Audit authentication configurations and rotate any potentially compromised credentials.

Vmg4325 B10A Firmware CVE-2025-0890

CRITICAL

Improper Authentication (CWE-287)

2025-02-04 security@zyxel.com.tw

Zyxel Authentication Bypass Vmg4325 B10A Firmware Sbg3500 N000 Firmware Vmg1312 B10A Firmware Vmg1312 B10B Firmware Vmg1312 B10E Firmware Vmg3312 B10A Firmware Vmg3313 B10A Firmware Vmg3926 B10B Firmware Vmg4380 B10A Firmware Vmg8324 B10A Firmware Vmg8924 B10A Firmware Sbg3300 N000 Firmware Sbg3300 Nb00 Firmware Sbg3500 Nb00 Firmware

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 18:24 vuln.today

CVE Published

Feb 04, 2025 - 11:15 nvd

CRITICAL 9.8

DescriptionCVE.org

UNSUPPORTED WHEN ASSIGNED Insecure default credentials for the Telnet function in the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an attacker to log in to the management interface if the administrators have the option to change the default credentials but fail to do so.

AnalysisAI

UNSUPPORTED WHEN ASSIGNED Insecure default credentials for the Telnet function in the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an attacker to log in. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Epss exploitation probability 23.8% and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. UNSUPPORTED WHEN ASSIGNED Insecure default credentials for the Telnet function in the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an attacker to log in to the management interface if the administrators have the option to change the default credentials but fail to do so. Affected products include: Zyxel Vmg4325-B10A Firmware, Zyxel Sbg3500-N000 Firmware, Zyxel Vmg1312-B10A Firmware, Zyxel Vmg1312-B10B Firmware, Zyxel Vmg1312-B10E Firmware. Version information: version 1.00.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.