What is the severity of ZDI-21-428?

The severity of ZDI-21-428 is categorized as high due to its potential for privilege escalation.

How do I fix ZDI-21-428?

To fix ZDI-21-428, users should update their Parallels Desktop software to the latest version provided by Parallels.

Who is affected by ZDI-21-428?

ZDI-21-428 affects users of Parallels Desktop for Mac who have low-privileged code execution capabilities.

What type of vulnerability is ZDI-21-428?

ZDI-21-428 is a privilege escalation vulnerability that allows attackers to gain higher access rights on the affected system.

What steps should I take if I cannot mitigate ZDI-21-428 immediately?

If immediate mitigation of ZDI-21-428 is not possible, restrict access to the affected system and monitor it for any suspicious activities.

Vulnerability/
ZDI-21-428

high

8.8

24/3/2025

ZDI-21-428: Parallels Desktop Toolgate Stack-based Buffer Overflow Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop. 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 validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor.

Affected Software	Affected Version	How to fix
Parallels

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Frequently Asked Questions

What is the severity of ZDI-21-428?
The severity of ZDI-21-428 is categorized as high due to its potential for privilege escalation.
How do I fix ZDI-21-428?
To fix ZDI-21-428, users should update their Parallels Desktop software to the latest version provided by Parallels.
Who is affected by ZDI-21-428?
ZDI-21-428 affects users of Parallels Desktop for Mac who have low-privileged code execution capabilities.
What type of vulnerability is ZDI-21-428?
ZDI-21-428 is a privilege escalation vulnerability that allows attackers to gain higher access rights on the affected system.
What steps should I take if I cannot mitigate ZDI-21-428 immediately?
If immediate mitigation of ZDI-21-428 is not possible, restrict access to the affected system and monitor it for any suspicious activities.

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agent/type
agent/severity
agent/title
agent/description
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agent/tags
agent/softwarecombine
agent/event
collector/zdi-advisory
source/ZDI
alias/ZDI-21-428
alias/ZDI-CAN-12220
alias/CVE-2021-31420
agent/software-canonical-lookup
agent/software-canonical-lookup-request
vendor/parallels
canonical/parallels

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