CVE-2021-34856
moderate-risk
Published 2021-10-25
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.
Do I need to act?
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0.15% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
8
CVSS 8.8/10
High
LOCAL
/ LOW complexity
Affected Products (1)
Affected Vendors
References (4)
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-938/
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-938/
33
/ 100
moderate-risk
Severity
27/34 · High
Exploitability
1/34 · Minimal
Exposure
5/34 · Minimal