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CVE-2026-28318

SolarWinds Serv-U Uncontrolled Resource Consumption

7.5 HIGHActively exploited (CISA KEV)EPSS 1.94%
  1. Published4 Jun 2026
  2. Added to CISA KEV5 Jun 2026
  3. Remediation due19 Jun 2026
Actively exploited (CISA KEV)

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.

Added to KEV: 5 Jun 2026Federal remediation due: 19 Jun 2026

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

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

SolarWinds Serv-u< 15.5.4 · 15.5.4

Remediation

Fixed in
SolarWinds Serv-u≥ 15.5.4

References

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Frequently asked

Is CVE-2026-28318 being actively exploited?

Yes. CVE-2026-28318 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 5 Jun 2026.

How severe is CVE-2026-28318?

CVE-2026-28318 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 1.94% probability of exploitation.

Which products are affected by CVE-2026-28318?

Affected products include SolarWinds Serv-u.

How do I fix CVE-2026-28318?

Upgrade affected software to a fixed version, for example SolarWinds Serv-u 15.5.4 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-28318 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.