Vulnerability Description
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, V5.11(AASZ.3)C0, and V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, and V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 and V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 and 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, and V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 and V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; and NAS540 V5.21(AATB.5)C0 and V5.21(AATB.3)C0.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Zyxel | Nas326 Firmware | < v5.21\(aazf.9\)c0 |
| Zyxel | Nas326 | - |
| Zyxel | Nas520 Firmware | < v5.21\(aasz.5\)c0 |
| Zyxel | Nas520 | - |
| Zyxel | Nas540 Firmware | < v5.21\(aatb.6\)c0 |
| Zyxel | Nas540 | - |
| Zyxel | Nas542 Firmware | < v5.21\(abag.6\)c0 |
| Zyxel | Nas542 | - |
Related Weaknesses (CWE)
References
- https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnVendor Advisory
- https://www.zyxel.com/us/en/support/security_advisories.shtmlVendor Advisory
- https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnVendor Advisory
- https://www.zyxel.com/us/en/support/security_advisories.shtmlVendor Advisory
FAQ
What is CVE-2020-13365?
CVE-2020-13365 is a vulnerability with a CVSS score of 8.8 (HIGH). 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 ...
How severe is CVE-2020-13365?
CVE-2020-13365 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-13365?
Check the references section above for vendor advisories and patch information. Affected products include: Zyxel Nas326 Firmware, Zyxel Nas326, Zyxel Nas520 Firmware, Zyxel Nas520, Zyxel Nas540 Firmware.