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CVE-2025-0890

Zyxel Vmg4325-b10a Firmware authentication bypass

9.8 CRITICALEPSS 13.6%
  1. Published4 Feb 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Zyxel Sbg3300-n000 Firmwareall versions
Zyxel Sbg3300-nb00 Firmwareall versions
Zyxel Sbg3500-n000 Firmwareall versions
Zyxel Sbg3500-nb00 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
Zyxel Vmg4325-b10a Firmwareall versions
Zyxel Vmg4380-b10a Firmwareall versions
Zyxel Vmg8324-b10a Firmwareall versions
Zyxel Vmg8924-b10a Firmwareall versions

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

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Frequently asked

Is CVE-2025-0890 being actively exploited?

CVE-2025-0890 is not in the CISA KEV catalog. Its EPSS exploit probability is 13.6%.

How severe is CVE-2025-0890?

CVE-2025-0890 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 13.6% probability of exploitation.

Which products are affected by CVE-2025-0890?

Affected products include Zyxel Sbg3300-n000 Firmware, Zyxel Sbg3300-nb00 Firmware, Zyxel Sbg3500-n000 Firmware, Zyxel Sbg3500-nb00 Firmware, Zyxel Vmg1312-b10a Firmware, and 9 more.

How do I fix CVE-2025-0890?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-0890 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.