CVE-2021-34857

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.1.3 (49160). An attacker must first obtain the ability to execute high-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 user-supplied data, which can result in a write past the end of an allocated buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-13601.

• CWE-787

• https://kb.parallels.com/125013Patch, Vendor Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-940/Third Party Advisory, VDB Entry
• https://kb.parallels.com/125013Patch, Vendor Advisory
• https://www.zerodayinitiative.com/advisories/ZDI-21-940/Third Party Advisory, VDB Entry

Published

Oct 25, 2021

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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