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.

INFO

Published Date :

Aug. 6, 2020, 5:15 p.m.

Last Modified :

Nov. 21, 2024, 5:01 a.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

2.8
Public PoC/Exploit Available at Github

CVE-2020-13364 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2020-13364 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Zyxel nas326_firmware
2 Zyxel nas540_firmware
3 Zyxel nas542_firmware
4 Zyxel nas520_firmware
5 Zyxel nas326
6 Zyxel nas520
7 Zyxel nas540
8 Zyxel nas542
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-13364.

URL Resource
https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml Vendor Advisory
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
https://www.zyxel.com/us/en/support/security_advisories.shtml Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Vulnerability research, firmware analysis, reverse engineering, programming notes (as much as I can)

reverse firmware linux iot programming vulnerability research exploitation

Updated: 1 year, 10 months ago
0 stars 0 fork 0 watcher
Born at : May 23, 2020, 3:11 p.m. This repo has been linked 2 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-13364 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-13364 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml
    Added Reference https://www.zyxel.com/us/en/support/security_advisories.shtml
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:h:zyzel:nas540:-:*:*:*:*:*:*:* OR *cpe:2.3:h:zyxel:nas540:-:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:h:zyzel:nas520:-:*:*:*:*:*:*:* OR *cpe:2.3:h:zyxel:nas520:-:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:h:zyzel:nas326:-:*:*:*:*:*:*:* OR *cpe:2.3:h:zyxel:nas326:-:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:zyzel:nas540_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(aatb.6)c0 OR *cpe:2.3:o:zyxel:nas540_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(aatb.6)c0
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:zyzel:nas520_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(aasz.5)c0 OR *cpe:2.3:o:zyxel:nas520_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(aasz.5)c0
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:zyzel:nas326_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(aazf.9)c0 OR *cpe:2.3:o:zyxel:nas326_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(aazf.9)c0
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:h:zyzel:nas542:-:*:*:*:*:*:*:* OR *cpe:2.3:h:zyxel:nas542:-:*:*:*:*:*:*:*
  • CPE Deprecation Remap by [email protected]

    Feb. 09, 2022

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:o:zyzel:nas542_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(abag.6)c0 OR *cpe:2.3:o:zyxel:nas542_firmware:*:*:*:*:*:*:*:* versions from (excluding) v5.21(abag.6)c0
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE CWE-269 NVD-CWE-noinfo
  • Initial Analysis by [email protected]

    Aug. 11, 2020

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:S/C:C/I:C/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Changed Reference Type https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml No Types Assigned https://www.zyxel.com/support/Zyxel-security-advisory-for-NAS-remote-access-vulnerability.shtml Vendor Advisory
    Changed Reference Type https://www.zyxel.com/us/en/support/security_advisories.shtml No Types Assigned https://www.zyxel.com/us/en/support/security_advisories.shtml Vendor Advisory
    Added CWE NIST CWE-269
    Added CPE Configuration AND OR *cpe:2.3:o:zyzel:nas326_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v5.21\(aazf.9\)c0 OR cpe:2.3:h:zyzel:nas326:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyzel:nas520_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v5.21\(aasz.5\)c0 OR cpe:2.3:h:zyzel:nas520:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyzel:nas540_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v5.21\(aatb.6\)c0 OR cpe:2.3:h:zyzel:nas540:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:zyzel:nas542_firmware:*:*:*:*:*:*:*:* versions up to (excluding) v5.21\(abag.6\)c0 OR cpe:2.3:h:zyzel:nas542:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-13364 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2020-13364 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.10 }} 0.00%

score

0.40035

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability