---
title: "CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-28318/
description: "CVE-2026-28318 (SolarWinds Serv-U): Exploited in the wild (CISA KEV). SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-06-04
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-28318"
kev: true
cvss: 7.5
epss: 0.01942
license: All rights reserved. Quote with attribution and a link.
---

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

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run SolarWinds Serv-U. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-06-05, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-06-19 ; treat that as the outer limit, not the target.
- EPSS 1.9% , percentile 80: FIRST’s model estimates a 1.9% chance of exploitation activity in the next 30 days, higher than 80% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.

## What it is

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 (CVE record)

- SolarWinds Serv-U: <= 15.5.4

## Severity

- SolarWinds CVSS 3.1: 7.5 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`

## Exploitation

- CISA KEV: added 2026-06-05; federal due date 2026-06-19. Known ransomware use: Unknown.
- 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact partial .
- FIRST EPSS (model of 2026-10-21): 1.94% probability of exploitation activity in the next 30 days; percentile 80.

## Sources

- [Listed in CISA KEV notes (solarwinds.com)](https://www.solarwinds.com/trust-center/security-advisories/cve-2026-28318)
- [Listed in CISA KEV notes (documentation.solarwinds.com)](https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm#link7)
- [CVE.org record CVE-2026-28318](https://www.cve.org/CVERecord?id=CVE-2026-28318)
- [NVD entry CVE-2026-28318](https://nvd.nist.gov/vuln/detail/CVE-2026-28318)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318)
- [solarwinds.com](https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318)
- [documentation.solarwinds.com](https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm)

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Source page: https://erroneo.us/security/cve/CVE-2026-28318/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt