// For flags

CVE-2021-3641

Improper Link Resolution Before File Access in Bitdefender GravityZone (VA-9921)

Severity Score

6.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

Improper Link Resolution Before File Access ('Link Following') vulnerability in the EPAG component of Bitdefender Endpoint Security Tools for Windows allows a local attacker to cause a denial of service. This issue affects: Bitdefender GravityZone version 7.1.2.33 and prior versions.

Una vulnerabilidad de Resolución de Enlaces Inapropiada versiones anteriores al Acceso a Archivos ("Link Following") en el componente EPAG de Bitdefender Endpoint Security Tools for Windows permite a un atacante local causar una denegación de servicio. Este problema afecta a: Bitdefender GravityZone versión 7.1.2.33 y versiones anteriores

This vulnerability allows local attackers to create a denial-of-service condition on affected installations of Bitdefender GravityZone. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the Endpoint Agent. By creating a symbolic link, an attacker can abuse the service to overwrite a file. An attacker can leverage this vulnerability to create a denial-of-service condition on the system.

*Credits: @Kharosx0 working with Trend Micro Zero Day Initiative
CVSS Scores
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
High
Attack Vector
Local
Attack Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-07-12 CVE Reserved
  • 2021-11-09 CVE Published
  • 2023-03-08 EPSS Updated
  • 2024-09-17 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-59: Improper Link Resolution Before File Access ('Link Following')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Bitdefender
Search vendor "Bitdefender"
Gravityzone
Search vendor "Bitdefender" for product "Gravityzone"
<= 7.1.2.33
Search vendor "Bitdefender" for product "Gravityzone" and version " <= 7.1.2.33"
-
Affected
in Microsoft
Search vendor "Microsoft"
Windows
Search vendor "Microsoft" for product "Windows"
--
Safe