CVE-2025-0890 Hardcoded credentials in VMG4325-B10A firmware

Critical 9.8 Published 4 Feb 2025 Updated 12 Feb 2025

Attackers can log in to the management interface using insecure default Telnet credentials if administrators fail to change them.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-0890?

CVE-2025-0890 is a critical vulnerability in Zyxel VMG4325-B10A firmware, published on 4 Feb 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-522, CWE-287

Which versions are affected by CVE-2025-0890?

It affects 14 products.

Products include Zyxel Sbg3300-N000 Firmware, Zyxel Sbg3300-Nb00 Firmware, Zyxel Sbg3500-N000 Firmware, Zyxel Sbg3500-Nb00 Firmware, Zyxel Vmg1312-B10a Firmware, Zyxel Vmg1312-B10b Firmware and 8 more.

How do I fix CVE-2025-0890?

No fix has been published for CVE-2025-0890 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-0890 being exploited?

There is no known exploitation of CVE-2025-0890 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-q2vf-jq2x-689c.