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CVE-2026-28318

HighPublished

SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability

Published: Jun 4, 2026
Updated: Jun 6, 2026
Assigning CNA: SolarWinds
Evidence observed: Jun 5, 2026

Primary CVSS

7.5/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

40.0%

Moderate · next 30 days

Percentile: 98.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

CISA Known Exploited

This CVE appears in the CISA Known Exploited Vulnerabilities catalog.

Summary

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

Sources

CVE-2026-28318-checkScanner
Safely detect whether a SolarWinds Serv-U host is vulnerable to CVE-2026-28318
servu-cve-2026-28318-pocPoC
SolarWinds Serv-U CVE-2026-28318: unauthenticated Content-Encoding: deflate crash. Root-cause analysis (invalid free of an interior pointer -> heap corruption) + DoS-only PoC. Fixed in 15.5.4 Hotfix 1.

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