CVE-2020-13364 - CVE House
Back to Database
Status published Medium CVE-2020-13364

A backdoor in certain Zyxel products allows remote TELNET access...

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2020-13364

Credits & Attribution

No credits recorded in the NVD database.

References

More from zyxel

View All →
CVE-2021-46387
ZyXEL ZyWALL 2 Plus Internet Security Appliance is affected by...
Medium 6.1
CVE-2021-3297
On Zyxel NBG2105 V1.00(AAGU.2)C0 devices, setting the login cookie to...
High 7.8
CVE-2020-29583
Firmware version 4.60 of Zyxel USG devices contains an undocumented...
Unknown 0
CVE-2020-29299
Certain Zyxel products allow command injection by an admin via...
High 7.2
CVE-2020-28899
The Web CGI Script on ZyXEL LTE4506-M606 V1.00(ABDO.2)C0 devices does...
Critical 9.1

Affected Vendor

Affected Software

nas326 firmware, nas520 firmware, nas540 firmware, nas542 firmware
Vulnerable Versions:
0

Timeline

Official Publish: August 6th, 2020
Last Modified: August 4th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.0/AC:L/AV:N/A:N/C:L/I:L/PR:N/S:U/UI:N

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.