CVE-2020-13364

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.

8.8

CVSS

Severity: High

CVSS 3.1 •

CVSS 3.0 •

CVSS 2.0 •

EPSS 0.24%

Vendor Advisory zyxel.com Vendor Advisory zyxel.com

Affected: n/a n/a

References

Link	Tags
https://www.zyxel.com/us/en/support/security_advisories.shtml	vendor advisory
https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml	vendor advisory

Frequently Asked Questions

What is the severity of CVE-2020-13364?: CVE-2020-13364 has been scored as a high severity vulnerability.
How to fix CVE-2020-13364?: To fix CVE-2020-13364, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2020-13364 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2020-13364 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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