CVE-2026-28318
Confirmed PUBLISHEDSolarWinds Serv-U Unauthenticated Denial of Service Vulnerability
Recommended Action
Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
At a Glance
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
- CVE Published
- Jun 04, 2026
- Exploitation Reported
- Jun 05, 2026
- CVSS
- 7.5 High
- EPSS
- 10.7%
Affected Versions
| Vendor | Product | Version | Status |
|---|---|---|---|
| SolarWinds |
Serv-U
|
15.5.4 and previous versions |
Affected |
CVE References
- solarwinds.com/trust-center/security-advisories/CVE-2026-28318 solarwinds.com · CVE Record https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-...
- documentation.solarwinds.com/en/success_center/servu/content/release_note... documentation.solarwinds.com · CVE Record https://documentation.solarwinds.com/en/success_center/servu/content/...
Recommended Actions
- Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.
- Check enrichment artifacts for scanner coverage and available PoCs before rolling remediation validation.
- Use the Pro API to automate enrichment, telemetry, and workflow delivery for VM, SOC, and CTI pipelines.
Known Exploited Vulnerability Sources
Catalogues that list this CVE as a known exploited vulnerability.
Per-source evidence links for KEV attestations are available through the KEVIntel Pro API.
Learn about Pro API access| Source | Added |
|---|---|
| CISA First | 2026-06-05 18:00 UTC |
| CVE | 2026-06-05 18:11 UTC |
| All CISA Advisories | 2026-06-05 19:20 UTC |
| TheHackerNews | 2026-06-06 09:20 UTC |
No detection artifacts or sensor request patterns are available for this CVE yet.
Check back as sensor telemetry and scanner integrations are updated.
Virtual Patch
Compensating WAF rules to help reduce exposure to this CVE. Rule content and deployable vendor exports are available with KEVIntel Enterprise.
KEVIntel does not currently have a virtual patch for this CVE. When available, KEVIntel virtual patches ship as deployable ModSecurity, Cloudflare, and AWS WAF rules.
Enterprise feature. Virtual patch rule content and deployable vendor exports (ModSecurity, Cloudflare, AWS WAF) are available to KEVIntel Enterprise users.
CVSS Scores
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Exploitation Status
Exploited in the wild
Recorded 2026-06-05 18:00:37 UTC · CISA
Proof of concept available
Recorded 2026-06-09 11:17:03 UTC · GitHub
Weaknesses (CWE)
-
Uncontrolled Resource Consumption
Recent Mentions
TheHackerNews · Jun 06, 2026
The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a high-severity security flaw impacting SolarWinds Serv-U multi-protocol file server software to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability, tracked as CVE-2026-28318 (CVSS score: 7.5), is a denial-of-service (DoS) bug that causes the service to crash
All CISA Advisories · Jun 05, 2026
CISA has added one new vulnerability to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-28318 SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability This type of vulnerability is a frequent attack vector for malicious cyber actors and poses significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria.
Potential Proof of Concepts
These PoCs are unverified and could contain malware. Use at your own risk.
github · Created 2026-06-12 20:09:57 UTC · 0 stars
Safely detect whether a SolarWinds Serv-U host is vulnerable to CVE-2026-28318
github · Created 2026-06-09 11:17:03 UTC · 0 stars
Timeline
Key exploitation, disclosure, scanner coverage, and KEV attestation events for this CVE.
-
11:17 UTC about 1 month ago11:17 UTC · about 1 month ago
Public PoC available
Public proof-of-concept code published
-
09:20 UTC about 1 month ago09:20 UTC · about 1 month ago
KEV confirmed by TheHackerNews
Exploitation attested by an external source
-
19:20 UTC about 1 month ago19:20 UTC · about 1 month ago
KEV confirmed by All CISA Advisories
Exploitation attested by an external source
-
18:11 UTC about 1 month ago18:11 UTC · about 1 month ago
KEV confirmed by CVE
Exploitation attested by an external source
-
18:00 UTC about 1 month ago18:00 UTC · about 1 month ago
Added to CISA KEV
Listed in the CISA Known Exploited Vulnerabilities catalog
-
14:05 UTC about 2 months ago14:05 UTC · about 2 months ago
CVE published
Vulnerability disclosed publicly
-
14:46 UTC 5 months ago14:46 UTC · 5 months ago
CVE ID reserved
Identifier reserved by the CNA
Automate This Intelligence with the Pro API
Confidence scoring, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.
Pro API Example
GET /api/v2/pro/kevs/CVE-2026-28318
{
"cve_id": "CVE-2026-28318",
"title": "SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability",
"affected_vendor": "SolarWinds",
"affected_product": "Serv-U",
"affected_versions": [
{ "vendor": "...", "product": "...", "status": "affected", "display_label": "..." }
],
"confidence": "Confirmed",
"cvss_score": 7.5,
"epss_score": 0.10659,
"exploit_status": {
"exploited_in_the_wild": true,
"active_exploitation_observed": false
},
"sensor_telemetry": { "...": "Pro API fields" },
"proof_of_concepts": [ "..." ],
"scanner_integrations": [ "..." ]
}