Known exploited vulnerability
CVE-2026-28318
The short answer
CVE-2026-28318 affects SolarWinds Serv-U and is rated high (CVSS 7.5). CISA added it to the Known Exploited Vulnerabilities catalog on 2026-06-05: attackers are using it, so patch it first.
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
Weakness: CWE-400.
Severity
7.5 high
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploited (CISA KEV)
Yes, since Jun 5, 2026
Federal due date Jun 19, 2026
EPSS, next 30 days
48%
Higher than 99% of scored CVEs
How it can be exploited
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
What CISA says to do
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected products
Serv-U. NVD's record lists the exact affected versions.
References
- documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm Release Notes
- www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318 Vendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318 US Government Resource
Questions
Is CVE-2026-28318 being exploited?
Yes. CISA added CVE-2026-28318 to its Known Exploited Vulnerabilities catalog on 2026-06-05, with a federal remediation due date of 2026-06-19.
How do I fix CVE-2026-28318?
CISA's 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.
From NVD, CISA KEV, FIRST EPSS and OSV.dev, checked . Status on NVD: Analyzed. The description is NVD's text, quoted as published.
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