What is CVE-2021-34855?

CVE-2021-34855 is a medium-severity vulnerability in Parallels Desktop, classified under Use of Uninitialized Resource. CVSS score: 6.5/10. Published 2021-10-25.

How severe is CVE-2021-34855?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Parallels Desktop

CVE-2021-34855

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.

EPSS: 0.003 (17.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N.

Affected products

Parallels Desktop — versions 16.1.3 (49160)
Parallels Parallels_desktop — versions 16.1.3

Weakness classification (CWE)

CWE-908 — Use of Uninitialized Resource

References

zdi-disclosures@trendmicro.com (Patch, x_refsource_MISC, Vendor Advisory)
zdi-disclosures@trendmicro.com (VDB Entry, Third Party Advisory, x_refsource_MISC)

Frequently asked questions

What is CVE-2021-34855?: CVE-2021-34855 is a medium-severity vulnerability in Parallels Desktop, classified under Use of Uninitialized Resource. CVSS score: 6.5/10. Published 2021-10-25.
How severe is CVE-2021-34855?: Medium severity. CVSS v3 base score is 6.5 out of 10.