CVE-2023-37250Public exploit

SYSTEM escalation via update DLL swap race

Published Aug 20, 2023 · Updated Oct 8, 2024

Local privilege escalation in Unity Parsec Loader 8 and earlier allows local users to execute arbitrary code as SYSTEM on Windows. The updater verifies a DLL under the user's %APPDATA%\Parsec directory, then calls LoadLibrary on the same path, allowing a junction swap before DllMain runs. Exploitation requires Parsec access, a Per User installation, the default ProgramData layout, and winning the narrow race; Shared User installations are not affected.

CVSS severity7.0
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Local privilege escalation in Unity Parsec Loader 8 and earlier allows local users to execute arbitrary code as SYSTEM on Windows. The updater verifies a DLL under the user's %APPDATA%\Parsec directory, then calls LoadLibrary on the same path, allowing a junction swap before DllMain runs. Exploitation requires Parsec access, a Per User installation, the default ProgramData layout, and winning the narrow race; Shared User installations are not affected.

The record

CVE
CVE-2023-37250
Published
Aug 20, 2023
Updated
Oct 8, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-367, T1574
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 20, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 8, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.0NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1574Hijack Execution Flow

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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