Patchfirst
CVE-2025-0890 Public exploit Critical · 9.8 EPSS 14.4%

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

Zyxel · VMG4325-B10A firmware

Summary

The Zyxel VMG4325-B10A firmware (version 1.00(AAFR.4)C0_20170615, a legacy DSL customer-premises router) ships with insecure default credentials for its Telnet management function. An attacker with network access to the device can log in to the management interface without authenticating as a legitimate user, provided the administrator has not changed the default credentials.

Official description · CVE.org

**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.

Breakdown
71.2 / 100
Exploited
Yes, in VulnCheck KEV
Reports
0
Tactics
0/15

First seen exploited 12 months after disclosure. Public exploit code (PoC-in-GitHub) appeared 18 months after disclosure.

  1. Disclosedday 0
  2. First seen exploitedVulnCheck KEV evidence+12 mo
  3. Public exploit codePoC-in-GitHub+18 mo

techniques

No techniques linked

No ATT&CK techniques are linked to this CVE yet. MITRE CTID has not mapped it, and no report passage in the corpus ties it to a technique.

What security researchers reported

Not named in any threat report yet

References

1 link, grouped by NVD tag
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