CVE-2023-28128Public exploitNetwork attack vector

Authenticated SYSTEM code execution via arbitrary file upload

Published May 9, 2023 · Updated Jan 28, 2025

Unrestricted file upload in Ivanti Avalanche 6.3.x and earlier allows remote authenticated users to execute arbitrary code as SYSTEM. The FileStoreConfig app accepts a Central FileStore path using an MS-DOS short name, enabling uploaded JSP content to be placed beneath the web root and executed. Exploitation requires high-privilege Avalanche authentication and grants control in the Windows SYSTEM context.

CVSS severity7.2
High
EPSS probability84.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Ivanti Avalanche 6.3.x and earlier allows remote authenticated users to execute arbitrary code as SYSTEM. The FileStoreConfig app accepts a Central FileStore path using an MS-DOS short name, enabling uploaded JSP content to be placed beneath the web root and executed. Exploitation requires high-privilege Avalanche authentication and grants control in the Windows SYSTEM context.

The record

CVE
CVE-2023-28128
Published
May 9, 2023
Updated
Jan 28, 2025
Vendor
Ivanti
Product
Avalanche
Classifications
CWE-434, T1505.003, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 9, 2023CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 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=Avalanche version 6.3.x and below

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Ivanti · Avalancheversion=Avalanche version 6.3.x and below

Published CVSS scores

7.2CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component Web Shell
T1190Exploit Public-Facing Application

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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