CVE-2025-0890

CRITICAL
2025-02-04 [email protected]
9.8
CVSS 3.1
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CVSS Vector

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

2
Analysis Generated
Mar 28, 2026 - 18:24 vuln.today
CVE Published
Feb 04, 2025 - 11:15 nvd
CRITICAL 9.8

Tags

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

Description

**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.

Analysis

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 Context

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.

Affected Products

Zyxel Vmg4325-B10A Firmware, Zyxel Sbg3500-N000 Firmware, Zyxel Vmg1312-B10A Firmware, Zyxel Vmg1312-B10B Firmware, Zyxel Vmg1312-B10E Firmware.

Remediation

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.

Priority Score

73
Low Medium High Critical
KEV: 0
EPSS: +23.8
CVSS: +49
POC: 0

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CVE-2025-0890 vulnerability details – vuln.today
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