CVEs / CVE-2026-28318
CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
- Known exploited in the CISA KEV catalog since 5 Jun 2026
- high 7.5 CVSS 3.1 (from the CNA)
- EPSS 43.6% chance of exploitation in the next 30 days, higher than 98% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
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.
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 and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| SolarWinds Serv-U | up to and including 15.5.4 | — |
Exploitation
| In CISA KEV since | 5 Jun 2026 |
|---|---|
| Due date for US federal agencies | 19 Jun 2026 |
| Used in ransomware campaigns | Unknown |
| 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. |
Severity
| CVSS 3.1 | 7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HScored by the CNA ([email protected]) |
|---|---|
| Weakness | CWE-400 |
References
- CVE-2026-28318 on NVD
- CVE-2026-28318 in the CISA KEV catalog
- https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28318 (cited by CISA)
- https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm#link7 (cited by CISA)
- 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
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.