Home/CVE/**UNSUPPORTED WHEN ASSIGNED** Insecure default credentials for the Telnet function in the legacy DSL CPE Zyxel VMG4325-B
CVE

CVE-2025-0890

**UNSUPPORTED WHEN ASSIGNED** Insecure default credentials for the Telnet function in the legacy DSL CPE Zyxel VMG4325-B

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.

CRITICAL · CVSS 9.8 EPSS 0.21668
Schedule remediation
  • EPSS ≥ 0.10 - elevated exploitation probability
  • EPSS percentile: top 4% of all CVEs by exploitation likelihood
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-287Improper Authentication
CWE-522Insufficiently Protected Credentials
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Affected Products & Versions

14
zyxel vmg4325-b10a firmwareall versions
zyxel sbg3500-n000 firmwareall versions
zyxel vmg1312-b10a firmwareall versions
zyxel vmg1312-b10b firmwareall versions
zyxel vmg1312-b10e firmwareall versions
zyxel vmg3312-b10a firmwareall versions
zyxel vmg3313-b10a firmwareall versions
zyxel vmg3926-b10b firmwareall versions
◈

Detection Rules (IDS/IPS)

3
et-openET EXPLOIT Zyxel DSL CPE Management Interface Default Credentials (supervisor) (CVE-2025-0890)attempted-admin
et-openET EXPLOIT Zyxel DSL CPE Management Interface Default Credentials (admin) (CVE-2025-0890)attempted-admin
et-openET EXPLOIT Zyxel DSL CPE Management Interface Default Credentials (zyuser) (CVE-2025-0890)attempted-admin
Open rulesets (ET Open, Snort Community, abuse.ch) link to source. Commercial rulesets are reference-only.
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · security@zyxel.com.tw
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD04 Feb 2025 · 11:15 AM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
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-02-04-2025Vendor Advisory
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