High severity · published Jul 15, 2022
CVE-2021-34987
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.1 (49187)
8.2
CVSS
0.3%
EPSS
No
On KEV
Description
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.1 (49187). 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 HDAudio virtual device. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the hypervisor. Was ZDI-CAN-14969.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PD
Parallels Desktop · Parallels
16.5.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-34987
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-34987
Vendor Advisory
https://kb.parallels.com/en/125013
Third Party Advisory
https://www.zerodayinitiative.com/advisories/ZDI-22-386/
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