CVE-2020-13365
8.8 · HIGHOverview
CVE-2020-13365 is a high-severity vulnerability affecting zyxel nas326_firmware. It was published on August 6, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from zyxel. Update nas326_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| zyxel | nas326_firmware | >= 0, < v5.21\(aazf.9\)c0 | Affected |
| zyxel | nas520_firmware | >= 0, < v5.21\(aasz.5\)c0 | Affected |
| zyxel | nas540_firmware | >= 0, < v5.21\(aatb.6\)c0 | Affected |
| zyxel | nas542_firmware | >= 0, < v5.21\(abag.6\)c0 | Affected |
References
Frequently Asked Questions
What is CVE-2020-13365?
CVE-2020-13365 is a high-severity vulnerability affecting zyxel nas326_firmware. It was published on August 6, 2020 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2020-13365?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2020-13365?
Check the references section for vendor advisories and patches from zyxel. Update nas326_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2020-13365?
CyberStrike's AI-powered security agents can automatically detect CVE-2020-13365 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
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