CVE-2024-4017

Privilege escalation via permissive DLL directory

Published Apr 19, 2024 · Updated Aug 1, 2024

DLL side-loading in BeyondTrust U-Series Appliance 3.4 through 4.0.2 allows local users to escalate privileges via C:\Appliance. Permissive file permissions on C:\Appliance let a low-privileged account plant a DLL that the filesystem modules load. Exploitation requires local low-privileged access to the appliance and grants the planted code the privileges of the loading process.

CVSS severity8.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

DLL side-loading in BeyondTrust U-Series Appliance 3.4 through 4.0.2 allows local users to escalate privileges via C:\Appliance. Permissive file permissions on C:\Appliance let a low-privileged account plant a DLL that the filesystem modules load. Exploitation requires local low-privileged access to the appliance and grants the planted code the privileges of the loading process.

The record

CVE
CVE-2024-4017
Published
Apr 19, 2024
Updated
Aug 1, 2024
Vendor
BeyondTrust
Product
U-Series Appliance
Classifications
CWE-269, CAPEC-641, T1574.002
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 1, 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?

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

  1. Affected versionversion=3.4 <4.0.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

BeyondTrust · U-Series Applianceversion=3.4 <4.0.3

Published CVSS scores

8.8BeyondTrustCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/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 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
CAPEC-641DLL Side-Loading
T1574.002Hijack Execution Flow: DLL Side-Loading

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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