Auth bypass in Zyxel Nas326

CVE-2020-13365

Certain Zyxel products have a locally accessible binary that allows a non-root user to generate a password for an undocumented user account that can be used for a TELNET session as root. This affects NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0…

Vulnerability class: Broken Authentication

EPSS: 0.010 (57.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2020-13365?
CVE-2020-13365 is a high-severity vulnerability in Zyxel Nas326, classified under Improper Authentication. CVSS score: 8.8/10. Published 2020-08-06.
How severe is CVE-2020-13365?
High severity. CVSS v3 base score is 8.8 out of 10.
Is CVE-2020-13365 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.