CVE-2020-13364 A backdoor in certain Zyxel products allows remote TELNET access via a CGI script.

What is CVE-2020-13364?

CVE-2020-13364 is a medium-severity vulnerability in n/a, published on 6 Aug 2020.

Official description

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.

Which versions are affected by CVE-2020-13364?

It affects 4 products.

Products include Zyxel Nas326 Firmware, Zyxel Nas520 Firmware, Zyxel Nas540 Firmware, Zyxel Nas542 Firmware.

How do I fix CVE-2020-13364?

No fix has been published for CVE-2020-13364 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-13364 being exploited?

There is no known exploitation of CVE-2020-13364 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2023-27992 Zyxel Multiple NAS Devices Command Injection Exploited Critical 9.8
• CVE-2024-6342 Command injection in NAS326 firmware Critical 9.8
• CVE-2024-29972 Command injection in NAS326 firmware Critical 9.8
• CVE-2024-29973 Command injection in NAS326 firmware Critical 9.8
• CVE-2024-29974 File upload in NAS326 firmware Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-cwv4-27xg-6829.