CVE-2021-34855 - CVE House
Back to Database
Status published Medium CVE-2021-34855

This vulnerability allows local attackers to disclose sensitive information on...

Vulnerability Description

This vulnerability allows local attackers to disclose sensitive information on affected installations of Parallels Desktop 16.1.3 (49160). An attacker must first obtain the ability to execute low-privileged code on the target guest system in order to exploit this vulnerability. The specific flaw exists within the Toolgate component. The issue results from the lack of proper initialization of memory prior to accessing it. An attacker can leverage this in conjunction with other vulnerabilities to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-13592.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2021-34855

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Jack Dates of RET2 Systems, Inc. (@ret2systems)

References

More from Parallels

View All →
CVE-2025-31359
A directory traversal vulnerability exists in the PVMP package unpacking...
High 8.8
CVE-2025-30074
Alludo Parallels Desktop before 19.4.2 and 20.x before 20.2.2 for...
High 7.8
CVE-2025-0413
Parallels Desktop Technical Data Reporter Link Following Local Privilege Escalation Vulnerability
High 7.8
CVE-2024-6240
Improper privilege management vulnerability in Parallels Desktop
High 7.7
CVE-2024-6154
Parallels Desktop Toolgate Heap-based Buffer Overflow Local Privilege Escalation Vulnerability
High 8.2

Affected Vendor

Affected Software

Desktop
Vulnerable Versions:
16.1.3 (49160)

Timeline

Official Publish: October 25th, 2021
Last Modified: August 4th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

Weaknesses (CWE)

CWE-908

MITRE ATT&CK TTPs

T1203 Exploitation for Client Execution
Execution
T1068 Exploitation for Privilege Escalation
Privilege Escalation
T1499.003 Application Exhaustion Flood
Impact