CVE entry · CVE-2026-28318
CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
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.
- Actively exploited: added to CISA’s KEV catalog on June 5, 2026.
- Use by ransomware: not established so far.
- Remediation deadline for US federal agencies: June 19, 2026.
Description from CISA’s KEV catalog.
What to do
- Check whether your estate includes SolarWinds Serv-U, including internet-facing devices.
- Apply the vendor’s patch or mitigations (references below). Failing that, isolate the product or stop using it, as CISA requires of US federal agencies.
- An exploited vulnerability has often been used before it was fixed: look for signs of compromise, especially on internet-facing devices.
References
- Vendor advisory or reference cited by CISA (www.solarwinds.com)
- Vendor advisory or reference cited by CISA (documentation.solarwinds.com)
- NVD entry (NIST)
- CISA KEV catalog