CVE-2020-13364
Zyxel NAS/NSA Remote TELNET Backdoor
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 :
Feb. 9, 2022, 4:51 p.m.
Source :
[email protected]
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.
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 |
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
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 [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:-:*:*:*:*:*:*:*
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