CVE-2026-28318Known exploitationNetwork attack vector

Unauthenticated service crash via deflate-encoded POST request

Published Jun 4, 2026 · Updated Jun 4, 2026

Uncontrolled resource consumption in SolarWinds Serv-U 15.5.4 and earlier allows remote attackers to crash the service via a crafted POST request. The HTTP request handler processes a deflate-encoded POST body without adequately controlling resource consumption, terminating the Serv-U service. No authentication or user interaction is required, and the documented consequence is a service crash rather than data access or modification.

CVSS severity7.5
High
EPSS probability40.01%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource consumption in SolarWinds Serv-U 15.5.4 and earlier allows remote attackers to crash the service via a crafted POST request. The HTTP request handler processes a deflate-encoded POST body without adequately controlling resource consumption, terminating the Serv-U service. No authentication or user interaction is required, and the documented consequence is a service crash rather than data access or modification.

The record

CVE
CVE-2026-28318
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
SolarWinds
Product
Serv-U
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record 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=15.5.4 and previous versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SolarWinds · Serv-Uversion=15.5.4 and previous versions

Published CVSS scores

7.5SolarWindsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Reported exploitation

Technologies

Your stack

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Your stack

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