CVE-2026-28318
SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability
Exploited in the wild. In CISA KEV since 2026‑06‑05. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
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
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Listed as exploited in the wild since 2026-06-05.
US federal agencies must remediate by 2026-06-19.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
1.9% chance of exploitation activity in the next 30 days, which ranks it in the 79th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
- Attention now
Rising.
Lifecycle
22 events over 112 days, from the signal feeds we watch.
- EPSS band changemoderate → lowepss band change
- EPSS band change0 → moderateepss band change
- EPSS band changemoderate → low
- EPSS band changemoderate → 0epss band change
- Patch availableworkaround available, record updated
- EPSS band changelow → moderate
Affected products
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Scored 7.5 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required NoneNo authentication required — anyone can exploit this
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality NoneNo confidentiality impact
- Integrity NoneNo integrity impact
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
- solarwinds.com/trust-center/security-advisories/CVE-2026-28318&
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318&
- documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm
And 3 more references. See all after sign-in
In the news
- Signature Optional - Analysis of CVE-2026-28323
- A Crash, Not a Shell: SolarWinds Serv-U CVE-2026-28318
- 8th June – Threat Intelligence Report
- ⚡ Weekly Recap: Instagram Account Hacks, Android Zero-Day, GitHub Worm and More
- SolarWinds Serv-U Vulnerability Exploited in the Wild
- Weekly Threat Intelligence: June 1 to June 7, 2026
- CISA Adds Actively Exploited SolarWinds Serv-U DoS Flaw to KEV Catalog
- CISA Warns of Actively Exploited SolarWinds Serv-U Flaw
- CISA: Hackers now exploit SolarWinds Serv-U flaw to crash servers
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We'll flag the next CVE, public exploit or patch for SolarWinds Serv-U, not every advisory. This one: actively exploited.
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