This vulnerability allows local attackers to disclose sensitive information on affected installations of Parallels Desktop 15.1.5-47309.

published 2021-04-29 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18327

cvss: 7.3; 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 20%
public exploits: 0; none known

This vulnerability allows local attackers to disclose sensitive information on affected installations of Parallels Desktop 15.1.5-47309. 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 Open Tools Gate component. The issue results from the lack of proper locking when performing operations on an object. 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-13082.

Exploit prediction

0.28% chance of exploitation in the next 30 days, higher than 20% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	7.3	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:L
NVD	3.1	5.6	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N
NVD	2.0	1.9	AV:L/AC:M/Au:N/C:P/I:N/A:N

Affected products

Parallels Desktop

Classification

Weakness

CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition
CWE-667 Improper Locking

References

kb.parallels.com /en/125013
vendor-advisory
zerodayinitiative.com /advisories/ZDI-21-435/
third-party-advisory, vdb-entry

Sources

CVE List CVE-2021-31427
NVD CVE-2021-31427

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Summary