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
Updated2026-06-05 19:32:38 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

EPSS: 0.106590000 probability, percentile 0.952560000 (date 2026-07-03)

CISA KEV: Listed on 2026-06-05; due 2026-06-19; ransomware use Unknown

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS: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

CISA Known Exploited Vulnerability

VendorSolarWinds
ProductServ-U
NameSolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
Required ActionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Noteshttps://www.solarwinds.com/trust-center/security-advisories/cve-2026-28318 ; https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm#link7 ; https://nvd.nist.gov/vuln/detail/CVE-2026-28318

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
www.cisa.gov/known-exploited-vulnerabilities-catalog 134c704f-9b21-4f2e-91b3-4a467353bcc0 www.cisa.gov US Government Resource
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
CISA Known Exploited Vulnerabilities catalog CISA www.cisa.gov kev

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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