What is CVE-2026-28318?

CVE-2026-28318 is a high-severity vulnerability in Solarwinds Serv-U, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-04.

How severe is CVE-2026-28318?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2026-28318 known to be exploited?

Yes. CVE-2026-28318 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-05), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.

Resource exhaustion in Solarwinds Serv-U

CVE-2026-28318

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

Vulnerability class: DoS (Denial of Service)

Published 2026-06-04 · last modified 2026-07-22.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.019 (79.8th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 79.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.400 · newest: 0.019 · change: -0.381

Affected products

Solarwinds Serv-U — versions 15.5.4, 15.5.4 and previous versions

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2026-06-05. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2026-06-19.

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.

Public proof-of-concept exploits

References

www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318 (Vendor Advisory)
documentation.solarwinds.com/en/success_center/servu/content/release_notes/serv… (Release Notes)
134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)

Frequently asked questions

What is CVE-2026-28318?: CVE-2026-28318 is a high-severity vulnerability in Solarwinds Serv-U, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-06-04.
How severe is CVE-2026-28318?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2026-28318 known to be exploited?: Yes. CVE-2026-28318 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-05), indicating it is being actively exploited. 3 public proof-of-concept repositories are indexed.