What’s Vulnerable › Vulnerabilities

CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2026-06-05
• EPSS: 43.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-04 · updated 2026-10-21
• Weakness: CWE-400

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

Affected products

• SolarWinds Serv-U: before 15.5.4; 15.5.4 — fixed in 15.5.4

How to fix

Upgrade to a fixed version: SolarWinds Serv-U 15.5.4. Check the vendor advisory for mitigations.

References

• https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm
• https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318

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