Zyxel VMG4325-B10A up to 1.00(AAFR.4)C0_20170615 Management Interface improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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9.8$0-$5k0.00

Summaryinfo

A vulnerability was found in Zyxel VMG4325-B10A up to 1.00(AAFR.4)C0_20170615. It has been classified as critical. Impacted is an unknown function of the component Management Interface. This manipulation causes improper authentication. This vulnerability is tracked as CVE-2025-0890. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as very critical was found in Zyxel VMG4325-B10A up to 1.00(AAFR.4)C0_20170615. Affected by this vulnerability is an unknown code block of the component Management Interface. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

**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.

It is possible to read the advisory at zyxel.com. This vulnerability is known as CVE-2025-0890 since 01/30/2025. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 12/15/2025).

The vulnerability scanner Nessus provides a plugin with the ID 242167 (Zyxel Legacy DSL CPE Router Multiple Vulnerabilities), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (242167). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.8
VulDB Meta Temp Score: 9.8

VulDB Base Score: 9.8
VulDB Temp Score: 9.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (Zyxel): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 242167
Nessus Name: Zyxel Legacy DSL CPE Router Multiple Vulnerabilities

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

01/30/2025 🔍
02/04/2025 +5 days 🔍
02/04/2025 +0 days 🔍
12/15/2025 +314 days 🔍

Sourcesinfo

Vendor: zyxel.com

Advisory: zyxel.com
Status: Confirmed

CVE: CVE-2025-0890 (🔍)
GCVE (CVE): GCVE-0-2025-0890
GCVE (VulDB): GCVE-100-294607

Entryinfo

Created: 02/04/2025 11:44
Updated: 12/15/2025 23:40
Changes: 02/04/2025 11:44 (28), 02/04/2025 11:47 (34), 07/17/2025 03:04 (2), 12/15/2025 23:40 (1)
Complete: 🔍
Committer: mitr
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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