What’s Vulnerable › Vulnerabilities

CVE-2021-34856

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-25 · updated 2026-06-17
• Weakness: CWE-119

Description

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 virtio-gpu virtual device. The issue results from the lack of proper validation of user-supplied data, which can result in a memory corruption condition. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-13581.

Affected products

• Parallels Desktop: 16.1.3

References

• https://kb.parallels.com/125013
• https://www.zerodayinitiative.com/advisories/ZDI-21-938/
• https://kb.parallels.com/125013
• https://www.zerodayinitiative.com/advisories/ZDI-21-938/

Get alerted when CVE-2021-34856 or the next vulnerability affects your stack