// For flags

CVE-2020-13365

 

Severity Score

8.8
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Certain Zyxel products have a locally accessible binary that allows a non-root user to generate a password for an undocumented user account that can be used for a TELNET session as root. 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.

Determinados productos Zyxel tienen un binario accesible localmente que permite a un usuario no root generar una contraseña para una cuenta de usuario no documentada que puede ser usada para una sesión de TELNET como root. Esto afecta a NAS520 V5.21(AASZ.4)C0, V5.21(AASZ.0)C0, V5.11(AASZ.3)C0, y V5.11(AASZ.0)C0; NAS542 V5.11(ABAG.0)C0, V5.20(ABAG.1)C0, y V5.21(ABAG.3)C0; NSA325 v2_V4.81(AALS.0)C0 y V4.81(AAAJ.1)C0; NSA310 4.22(AFK.0)C0 y 4.22(AFK.1)C0; NAS326 V5.21(AAZF.8)C0, V5.11(AAZF.4)C0, V5.11(AAZF.2)C0, y V5.11(AAZF.3)C0; NSA310S V4.75(AALH.2)C0; NSA320S V4.75(AANV.2)C0 y V4.75(AANV.1)C0; NSA221 V4.41(AFM.1)C0; y NAS540 V5.21(AATB.5)C0 y V5.21(AATB.3)C0

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Attack Vector
Network
Attack Complexity
Low
Authentication
Single
Confidentiality
Complete
Integrity
Complete
Availability
Complete
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2020-05-21 CVE Reserved
  • 2020-08-06 CVE Published
  • 2023-03-07 EPSS Updated
  • 2024-08-04 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-287: Improper Authentication
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Zyxel
Search vendor "Zyxel"
 Nas326 Firmware
Search vendor "Zyxel" for product "Nas326 Firmware"
 < v5.21\(aazf.9\)c0
Search vendor "Zyxel" for product "Nas326 Firmware" and version " < v5.21\(aazf.9\)c0"
-
Affected
in Zyxel
Search vendor "Zyxel"
 Nas326
Search vendor "Zyxel" for product "Nas326"
--
Safe
Zyxel
Search vendor "Zyxel"
 Nas520 Firmware
Search vendor "Zyxel" for product "Nas520 Firmware"
 < v5.21\(aasz.5\)c0
Search vendor "Zyxel" for product "Nas520 Firmware" and version " < v5.21\(aasz.5\)c0"
-
Affected
in Zyxel
Search vendor "Zyxel"
 Nas520
Search vendor "Zyxel" for product "Nas520"
--
Safe
Zyxel
Search vendor "Zyxel"
 Nas540 Firmware
Search vendor "Zyxel" for product "Nas540 Firmware"
 < v5.21\(aatb.6\)c0
Search vendor "Zyxel" for product "Nas540 Firmware" and version " < v5.21\(aatb.6\)c0"
-
Affected
in Zyxel
Search vendor "Zyxel"
 Nas540
Search vendor "Zyxel" for product "Nas540"
--
Safe
Zyxel
Search vendor "Zyxel"
 Nas542 Firmware
Search vendor "Zyxel" for product "Nas542 Firmware"
 < v5.21\(abag.6\)c0
Search vendor "Zyxel" for product "Nas542 Firmware" and version " < v5.21\(abag.6\)c0"
-
Affected
in Zyxel
Search vendor "Zyxel"
 Nas542
Search vendor "Zyxel" for product "Nas542"
--
Safe