Cyber Resilience

CVE-2023-27327

Race Condition in Parallels Desktop ≤ 18.1.1_\(53328\)

Race Condition
Published
03 May 2024
Modified
06 August 2025
Patch / advisory
View advisory
CVSS Score v3 7.5
Click a component to see what it means
Raw vectorCVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
EPSS Score 0.0040 33th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2023-27327 is a high-severity Time-of-check Time-of-use (TOCTOU) Race Condition (CWE-367) vulnerability in Parallels Parallels Desktop. Its CVSS base score is 7.5 (High).

Operationally, ranked at the 33th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

Parallels Desktop Toolgate Time-Of-Check Time-Of-Use Local Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Parallels Desktop. An attacker must first obtain the ability to execute high-privileged code on the target guest system in…

more

order to exploit this vulnerability. The specific flaw exists within the Toolgate component. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the current user on the host system. Was ZDI-CAN-18964.

CWE(s)
CWE-367

Related Threats

CVEs Like This One

CVE-2023-27323Same product: Parallels Parallels Desktop
CVE-2024-6153Same product: Parallels Parallels Desktop
CVE-2023-27325Same product: Parallels Parallels Desktop
CVE-2024-6154Same product: Parallels Parallels Desktop
CVE-2023-27328Same product: Parallels Parallels Desktop
CVE-2025-31359Same product: Parallels Parallels Desktop
CVE-2024-6240Same product: Parallels Parallels Desktop
CVE-2024-36486Same product: Parallels Parallels Desktop
CVE-2024-52561Same product: Parallels Parallels Desktop
CVE-2024-54189Same product: Parallels Parallels Desktop

Affected Assets

parallels
parallels desktop
≤ 18.1.1_\(53328\)

Mitigating Controls

Control response

Prevent
Stop it (NIST 800-53)

—

Detect
Catch it (NIST detect / respond)

—

Harden
Shrink the surface (DISA STIG)

—

Validate
Prove the fix (OWASP ASVS)
  • V15.4.2
  • V17.2.6

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

AU-8 Time Stamps
addresses: CWE-367

Timestamps meeting UTC or offset standards help identify TOCTOU issues through precise chronological reconstruction of check/use operations.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly include coding standards and reviews that prevent TOCTOU race conditions.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.17 Clock synchronization none match
none

Reliable, synchronized time across systems narrows the exploitable window in which a resource state can change between a security check and its use.

References