CVE-2026-28318

Name: CVE-2026-28318
Creator: NVD / NIST
Published: 2026-06-04T15:16:50.407+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10Actively ExploitedEPSS 10.66%

Last modified Jun 17, 2026

CVE-2026-28318 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. CISA has confirmed active exploitation in the wild. EPSS estimates a 10.66% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

10.66%

95.2th percentile

Probability of exploitation in the next 30 days. Learn more

Exploitation Status

This vulnerability is listed in CISA’s Known Exploited Vulnerabilities catalog, confirming active exploitation in the wild. Federal agencies must remediate by Jun 19, 2026.

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Solarwinds	Serv-U	< 15.5.4
Solarwinds	Serv-U	15.5.4

References

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

Timeline

Published: Jun 4, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-28318?

How severe is CVE-2026-28318?

CVE-2026-28318 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 10.66% probability of exploitation in the next 30 days. This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog.

How do I fix CVE-2026-28318?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28318?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST