Home/CVE/This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.1 (
CVE

CVE-2021-34987

This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.1 (

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.

HIGH · CVSS 8.2 EPSS 0.00083
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
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Affected Products & Versions

1
parallels desktopall versions
▣

Scoring & Timeline

8.2
HIGH · CVSS v3.1 · zdi-disclosures@trendmicro.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD15 Jul 2022 · 07:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
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References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://kb.parallels.com/en/125013Vendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-22-386/Third Party AdvisoryVDB Entry
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