// For flags

CVE-2021-26737

Privilege Escalation Using PID Reuse in ZCC macOS

Severity Score

4.7
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Track
*SSVC
Descriptions

The Zscaler Client Connector for macOS prior to 3.6 did not sufficiently validate RPC clients. A local adversary without sufficient privileges may be able to shutdown the Zscaler tunnel by exploiting a race condition.

Zscaler Client Connector para macOS anterior a 3.6 no validaba suficientemente los clientes RPC. Un adversario local sin privilegios suficientes podría cerrar el túnel Zscaler aprovechando una condición de ejecución.

*Credits: Thomas Chauchefoin (SonarSource), Dave Satchell (Avast Red Team)
CVSS Scores
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
* Common Vulnerability Scoring System
SSVC
  • Decision:Track
Exploitation
None
Automatable
No
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2021-02-05 CVE Reserved
  • 2023-10-23 CVE Published
  • 2023-10-24 EPSS Updated
  • 2024-09-11 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-346: Origin Validation Error
CAPEC
  • CAPEC-26: Leveraging Race Conditions
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Zscaler
Search vendor "Zscaler"
 Client Connector
Search vendor "Zscaler" for product "Client Connector"
 < 3.6
Search vendor "Zscaler" for product "Client Connector" and version " < 3.6"
macos
Affected