CVE-2021-34987 json
This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop 16.5.1 (49187).
published 2022-07-15 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-21634
- cvss
- 8.2
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
Summary
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.
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 8.2 | CVSS:3.0/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| NVD | 3.1 | 8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
Affected products
- Parallels Desktop
Classification
- Weakness
-
- CWE-120 Buffer Copy without Checking Size of Input
References
-
kb.parallels.com
/en/125013
vendor-advisory
-
zerodayinitiative.com
/advisories/ZDI-22-386/
third-party-advisory, vdb-entry
Sources
- CVE List CVE-2021-34987
- NVD CVE-2021-34987
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