CVE-2020-13364
First published: Thu Aug 06 2020(Updated: )
A backdoor in certain Zyxel products allows remote TELNET access via a CGI script. 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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| 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 |
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Reference Links
Frequently Asked Questions
What is CVE-2020-13364?
CVE-2020-13364 is a backdoor vulnerability found in certain Zyxel products that allows remote TELNET access via a CGI script.
Which Zyxel products are affected by CVE-2020-13364?
CVE-2020-13364 affects the following Zyxel products: 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; and NSA310 4.22(AFK.
How can the CVE-2020-13364 vulnerability be exploited?
CVE-2020-13364 can be exploited by an attacker to gain remote TELNET access to the affected Zyxel products via a CGI script.
What is the severity of CVE-2020-13364?
CVE-2020-13364 has a severity score of 8.8, which is classified as critical.
Where can I find more information about CVE-2020-13364?
You can find more information about CVE-2020-13364 on the Zyxel support website: https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml
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