CVE-2025-40539Network attack vector

Administrative arbitrary native code execution

Published Feb 24, 2026 · Updated Feb 24, 2026

Type confusion in SolarWinds Serv-U 15.5.3 and earlier allows remote authenticated users to execute arbitrary native code. SolarWinds has not disclosed the affected component, confused types, or operation that applies an incorrect cast to attacker-controlled data. Administrative privileges are required; successful exploitation runs code as root on Linux and as the configured Serv-U service account on Windows.

CVSS severity9.1
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in SolarWinds Serv-U 15.5.3 and earlier allows remote authenticated users to execute arbitrary native code. SolarWinds has not disclosed the affected component, confused types, or operation that applies an incorrect cast to attacker-controlled data. Administrative privileges are required; successful exploitation runs code as root on Linux and as the configured Serv-U service account on Windows.

The record

CVE
CVE-2025-40539
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
SolarWinds
Product
Serv-U
Classifications
CWE-704, CAPEC-233, T1068
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=SolarWinds Serv-U 15.5.3 and prior versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

SolarWinds · Serv-Uversion=SolarWinds Serv-U 15.5.3 and prior versions

Published CVSS scores

7.2NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
9.1SolarWindsCVSS:3.1/AV:N/AC:L/PR:H/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.

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

No observations available

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

Weakness, pattern, technique

CWE-704Incorrect Type Conversion or Cast
CAPEC-233Privilege Escalation
T1068Exploitation for Privilege Escalation

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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