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9.8
CRITICAL CVSS 3.1
CVE-2025-0890
Zyxel Telnet Default Credentials Vulnerability
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.

INFO

Published Date :

Feb. 4, 2025, 11:15 a.m.

Last Modified :

Dec. 15, 2025, 9:02 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2025-0890 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Zyxel vmg1312-b10a_firmware
2 Zyxel vmg4380-b10a_firmware
3 Zyxel vmg8324-b10a_firmware
4 Zyxel vmg8924-b10a_firmware
5 Zyxel sbg3300-n000_firmware
6 Zyxel sbg3300-nb00_firmware
7 Zyxel sbg3500-n000_firmware
8 Zyxel vmg8324-b10a
9 Zyxel vmg1312-b10a
10 Zyxel vmg4380-b10a
11 Zyxel vmg8924-b10a
12 Zyxel sbg3300-n000
13 Zyxel sbg3300-nb00
14 Zyxel sbg3500-n000
15 Zyxel vmg1312-b10b_firmware
16 Zyxel vmg1312-b10b
17 Zyxel vmg1312-b10e_firmware
18 Zyxel vmg1312-b10e
19 Zyxel vmg3312-b10a_firmware
20 Zyxel vmg3312-b10a
21 Zyxel vmg3313-b10a_firmware
22 Zyxel vmg3313-b10a
23 Zyxel vmg3926-b10b_firmware
24 Zyxel vmg3926-b10b
25 Zyxel vmg4325-b10a_firmware
26 Zyxel vmg4325-b10a
27 Zyxel sbg3500-nb00_firmware
28 Zyxel sbg3500-nb00
: Total Affected Vendor : 1 | Products : 28
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 CRITICAL [email protected]
Solution
This information is provided by the 3rd party feeds.
  • See vendor advisory
Public PoC/Exploit Available at Github

CVE-2025-0890 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-0890.

URL Resource
https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025 Vendor Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-0890 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-0890 weaknesses.

CAPEC-22: Exploiting Trust in Client Exploiting Trust in Client CAPEC-57: Utilizing REST's Trust in the System Resource to Obtain Sensitive Data Utilizing REST's Trust in the System Resource to Obtain Sensitive Data CAPEC-94: Adversary in the Middle (AiTM) Adversary in the Middle (AiTM) CAPEC-114: Authentication Abuse Authentication Abuse CAPEC-115: Authentication Bypass Authentication Bypass CAPEC-151: Identity Spoofing Identity Spoofing CAPEC-194: Fake the Source of Data Fake the Source of Data CAPEC-593: Session Hijacking Session Hijacking CAPEC-633: Token Impersonation Token Impersonation CAPEC-650: Upload a Web Shell to a Web Server Upload a Web Shell to a Web Server CAPEC-50: Password Recovery Exploitation Password Recovery Exploitation CAPEC-102: Session Sidejacking Session Sidejacking CAPEC-474: Signature Spoofing by Key Theft Signature Spoofing by Key Theft CAPEC-509: Kerberoasting Kerberoasting CAPEC-551: Modify Existing Service Modify Existing Service CAPEC-555: Remote Services with Stolen Credentials Remote Services with Stolen Credentials CAPEC-560: Use of Known Domain Credentials Use of Known Domain Credentials CAPEC-561: Windows Admin Shares with Stolen Credentials Windows Admin Shares with Stolen Credentials CAPEC-600: Credential Stuffing Credential Stuffing CAPEC-644: Use of Captured Hashes (Pass The Hash) Use of Captured Hashes (Pass The Hash) CAPEC-645: Use of Captured Tickets (Pass The Ticket) Use of Captured Tickets (Pass The Ticket) CAPEC-652: Use of Known Kerberos Credentials Use of Known Kerberos Credentials CAPEC-653: Use of Known Operating System Credentials Use of Known Operating System Credentials

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

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Ostorlab/KEV

Ostorlab KEV: One-command to detect most remotely known exploitable vulnerabilities. Sourced from CISA KEV, Google's Tsunami, Ostorlab's Asteroid and Bug Bounty programs.

cisa-kev vulnerability 0day cisa exploits

Updated: 2 months, 1 week ago
588 stars 42 fork 42 watcher
Born at : April 19, 2022, 8:58 a.m. This repo has been linked 1290 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-0890 vulnerability anywhere in the article.

  • Daily CyberSecurity
0-Click NTLM Authentication Bypass Hits Microsoft Telnet Server, PoC Releases, No Patch

A severe vulnerability affecting Microsoft Telnet Server has been uncovered, allowing remote attackers to completely bypass authentication and gain administrator access without valid credentials. Deta ... Read more

Published Date: Apr 29, 2025 (7 months, 3 weeks ago)
  • Help Net Security
Swap EOL Zyxel routers, upgrade Netgear ones!

There will be no patches for EOL Zyxel routers under attack via CVE-2024-40891, the company has confirmed. Meanwhile, Netgear has issued patches for critical flaws affecting its routers and wireless a ... Read more

Published Date: Feb 05, 2025 (10 months, 2 weeks ago)
  • security.nl
Zyxel waarschuwt voor actief aangevallen lekken in end-of-life modems

Zyxel waarschuwt eigenaren van verschillende modem-routers voor actief aangevallen kwetsbaarheden. De apparaten in kwestie zijn end-of-life en Zyxel zal dan ook geen updates uitbrengen om de beveiligi ... Read more

Published Date: Feb 05, 2025 (10 months, 2 weeks ago)
  • BleepingComputer
Zyxel won’t patch newly exploited flaws in end-of-life routers

Zyxel has issued a security advisory about actively exploited flaws in CPE Series devices, warning that it has no plans to issue fixing patches and urging users to move to actively supported models. V ... Read more

Published Date: Feb 04, 2025 (10 months, 2 weeks ago)

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-0890 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Dec. 15, 2025

    Action Type Old Value New Value
    Added CWE CWE-522
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg4325-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg4325-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:sbg3500-n000_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:sbg3500-n000:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg1312-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg1312-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg1312-b10b_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg1312-b10b:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg1312-b10e_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg1312-b10e:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg3312-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg3312-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg3313-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg3313-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg3926-b10b_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg3926-b10b:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg4325-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg4325-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg4380-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg4380-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg8324-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg8324-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:vmg8924-b10a_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:vmg8924-b10a:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:sbg3300-n000_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:sbg3300-n000:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:sbg3300-nb00_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:sbg3300-nb00:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyxel:sbg3500-nb00_firmware:-:*:*:*:*:*:*:* OR cpe:2.3:h:zyxel:sbg3500-nb00:-:*:*:*:*:*:*:*
    Added Reference Type Zyxel Corporation: https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025 Types: Vendor Advisory
  • New CVE Received by [email protected]

    Feb. 04, 2025

    Action Type Old Value New Value
    Added Tag unsupported-when-assigned
    Added 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.
    Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    Added CWE CWE-287
    Added Reference https://www.zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 9.8
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact