CVE-2026-28318

SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability

Published Jun 4, 2026 CVSS 3.1 · 7.5 High EPSS 48.0% KEV · Listed
Description
SolarWinds 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

Remediation

Vendor Solution

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


Vendor Workaround

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

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
References
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'active', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics kev

{'dateAdded': '2026-06-05T00:00:00+00:00', 'dueDate': '2026-06-19T00:00:00+00:00'}

Type Values Removed Values Added
CPEs cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:*
cpe:2.3:a:solarwinds:serv-u:15.5.4:-:*:*:*:*:*:*
Type Values Removed Values Added
First Time appeared Solarwinds
Solarwinds serv-u
Vendors & Products Solarwinds
Solarwinds serv-u
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description SolarWinds 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
Title SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability
Weaknesses CWE-400
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
SolarWinds
Published
Updated
Oct 21, 2026, 10:29 AM
Reserved
Feb 26, 2026, 2:46 PM
Status
Analyzed
Published
Jun 4, 2026, 3:16 PM
Modified
Oct 21, 2026, 11:17 AM