SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability

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Summary

CVECVE-2026-28318
StatePUBLISHED
AssignerSolarWinds
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-04 15:16:50 UTC
Updated2026-06-04 19:51:26 UTC
DescriptionSolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service without authentication using Content-Encoding: deflate. Mitigation steps are provided to secure customer environments in the SolarWinds Trust Center if you are unable to deploy the update

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-400 | CWE-400 CWE-400 Uncontrolled Resource Consumption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNACVSS7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Solarwinds Serv-u All All All All
Application Solarwinds Serv-u 15.5.4 - All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SolarWinds Serv-U affected 15.5.4 and previous versions Windows, Linux

References

ReferenceSourceLinkTags
www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318 [email protected] www.solarwinds.com Vendor Advisory
documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-ho... [email protected] documentation.solarwinds.com Release Notes
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to SolarWinds Serv-U 15.5.4 Hotfix 1. Use the mitigation steps until the upgrade is possible.

Workarounds

CNA: Block any POST requests containing 'Content-Encoding: deflate'. This function is not required for SolarWinds Serv-U.

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