High 7.5Known exploited (CISA KEV)Published Jun 4, 2026

CVE-2026-28318SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability

Updated under an hour ago (Oct 26, 2026, 7:50 PM ET)

Does this affect you?

It affects SolarWinds Serv-U and 1 other product. Add what you run to find out whether that includes you.

CISA lists it as known exploited since Jun 5, 2026; federal agencies had to remediate by Jun 19, 2026. Treat that date as your deadline.

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Every CVE for SolarWinds Serv-U

Exploited in the last 30 days

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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-400
Known exploited: Added to CISA KEV Jun 5, 2026; federal remediation due Jun 19, 2026Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
EPSS (exploitation in the next 30 days): 43.65% (percentile 99)
Assigned by: SolarWinds
NVD analysis: Analyzed
Record last updated: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

SolarWinds Serv-U solarwinds:serv_u (from the name)	through 15.5.4	CNA record
solarwinds serv-u solarwinds:serv-u	before 15.5.4; 15.5.4	NVD

References

References

https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318	vendor-advisory
https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm	release-notes
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318	us-government-resource

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.