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Exploited vulnerability · CISA KEV

Is CVE-2026-28318 exploited? Yes: in CISA KEV since 5 Jun 2026

Gociux · SolarWinds Serv-U · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-28318, SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 5 Jun 2026, 1 days after it was published. It affects SolarWinds Serv-U. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 5 Jun 2026
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity7.5CVSS 3.1 · high
US federal due19 Jun 2026BOD 22-01 deadline

What it is

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.

VendorSolarWinds (11 exploited CVEs in KEV)
ProductServ-U
VulnerabilitySolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
WeaknessCWE-400
Published4 Jun 2026
Added to KEV5 Jun 2026
Reported by (CNA)SolarWinds

What to do

  1. Check whether you run it. Look for Serv-U in your asset inventory, including appliances and cloud images. Stack check lists every exploited SolarWinds CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 4 Jun 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for SolarWinds.

Other exploited CVEs in Serv-U

References

Questions

Is CVE-2026-28318 being exploited?

Yes. CISA added CVE-2026-28318 to the Known Exploited Vulnerabilities catalog on 5 Jun 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-28318 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-28318?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check SolarWinds's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Serv-U and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2026 · SolarWinds scorecard · act-now radar.

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