# CVE-2026-28318: SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability

> CVE-2026-28318: SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability. CVSS 7.5 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-28318
Last updated: 2026-10-21T11:17:07Z

- Published: 2026-06-04 14:05 UTC · Updated: 2026-10-21 11:17 UTC · Assigner: SolarWinds
- CVSS: 7.5 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS: 43.7%, 99th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-06-05, federal due date 2026-06-19, ransomware use: Unknown
- CWE: 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

## CISA required action

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

## Affected vendors and products

- SolarWinds: Serv-U

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-28318)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-28318)
- [https://documentation.solarwinds.com/en/success\_center/servu/content/release\_notes/servu\_15-5-4-hotfix-1\_release\_notes.htm](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.solarwinds.com/trust-center/security-advisories/CVE-2026-28318)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-28318 · Markdown: https://rewindex.com/cve/CVE-2026-28318.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-28318 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:10:42.893Z