CVE-2022-24750

SYSTEM privilege escalation via unrestricted DSM plugin path

Published Mar 10, 2022 · Updated Apr 23, 2025

Local privilege escalation in UltraVNC Server 1.3.8.0 and earlier allows local users to execute code with SYSTEM privileges. The DSM plugin selector passes a user-supplied path to LoadPlugin without stripping directory components, so a service process loads an attacker-controlled DLL outside the installation directory. The server must run as a Windows service with elevated privileges, and the attacker needs a local authenticated account to supply the plugin path.

CVSS severity8.8
High
EPSS probability0.28%
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 UltraVNC Server 1.3.8.0 and earlier allows local users to execute code with SYSTEM privileges. The DSM plugin selector passes a user-supplied path to LoadPlugin without stripping directory components, so a service process loads an attacker-controlled DLL outside the installation directory. The server must run as a Windows service with elevated privileges, and the attacker needs a local authenticated account to supply the plugin path.

The record

CVE
CVE-2022-24750
Published
Mar 10, 2022
Updated
Apr 23, 2025
Vendor
UltraVNC Team
Product
UltraVNC
Classifications
CWE-269, T1574.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 10, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 23, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.3.8.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

UltraVNC Team · UltraVNCversion=< 1.3.8.0

Published CVSS scores

8.8GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.2NIST National Vulnerability DatabaseAV:L/AC:L/Au:N/C:C/I:C/A:C

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1574.001Hijack Execution Flow: DLL

Public exploit references

No public exploit references are available in this record.

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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