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

CISA Known Exploited Vulnerabilities

Name

SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability

Vendor

SolarWinds

Product

Serv-U

Added to the catalog

2026-06-05

Due date for US federal agencies

2026-06-19

Weaknesses

CWE-400

Catalog version

2026.10.30

SolarWinds Serv-U contains an uncontrolled resource consumption vulnerability that allows specially crafted POST requests using the Content-Encoding: deflate header to crash the Serv-U service without authentication.

Required action (CISA)

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

Ransomware use: CISA does not mark known use of this vulnerability in ransomware campaigns.

Links in CISA's notes

• https://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

Read on 2026-11-02T23:39:54.475Z under licence cisa-kev-cc0@b0067899 from https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

NVD analysis

Status

Analyzed

Published

2026-06-04T15:16:50.407

Last modified

2026-10-21T11:17:07.457

Weaknesses

CWE-400

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

References

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

This product uses the NVD API but is not endorsed or certified by the NVD.

Read on 2026-11-02T23:42:31.494Z under licence nvd-api-terms-of-use@ff2a5288 from https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-28318

CVE record

Title (CNA)

SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability

Assigner

SolarWinds

State

PUBLISHED

Published

2026-06-04T14:05:58.218Z

Updated

2026-10-21T10:29:06.114Z

Problem types

CWE-400 Uncontrolled Resource Consumption

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

References

• https://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

Read on 2026-11-03T02:19:33.932Z under licence cve-terms-of-use@81bfa2f3 from https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/28xxx/CVE-2026-28318.json

Defensive techniques (MITRE D3FEND)

D3FEND maps these defensive techniques to the weakness (CWE) that NVD lists for this CVE, through the digital artifacts the weakness affects. D3FEND does not say they stop this vulnerability.

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