Vulnerability

CVE-2026-28318

—· 7.5KEVCVSS7.5EPSS6%

.rules3/5

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.

Threat signal

86/100

High

Severity

none

CVSS

7.5

EPSS

Active

KEV

CISA KEV — actively exploited

4d remaining

AffectedSolarWinds — Serv-U

Added to KEV

2026-06-05

Federal patch due (BOD 22-01)

2026-06-19

Required action (CISA verbatim)

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor advisory + references

CISA description: “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.”

CVSS

v3.1Open in FIRST calculator →

7.5/ 10HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredNoneUnauthenticated — no credentials needed.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactNoneNo confidentiality impact.
Integrity ImpactNoneNo integrity impact.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

6.26%

probability of exploitation in next 30 days

p91

higher than 91% of all CVEs

4-day trend↓ 1.6pp

Mid-pack — moderate exploitation likelihood.

Vendor VEX

No VEX statements published for CVE-2026-28318. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: no
impact: total
mission: support

Lifecycle

2026-06-05Added to CISA KEVransomware: Unknown
2026-06-05Published
2026-06-05Mentioned in rss:cisaCISA Adds One Known Exploited Vulnerability to Catalog
2026-06-06Mentioned in rss:thehackernewsCISA Adds Actively Exploited SolarWinds Serv-U DoS Flaw to KEV Catalog
2026-06-12Last modified1 source
2026-06-19Federal patch due (BOD 22-01)

Entity graph

3 nodes · 2 edges · click to pivot

CVEActorVendor advisoryIOCNews

Mentions in news & research

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.