CVE-2026-28318 | SolarWinds Serv-U Unauthenticated Denial of Service Vulnerability

Exp

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

Published: 2026-06-04 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-28318 is rated Critical Active Threat (93.3/100): CVSS High severity, with high exploitation likelihood (EPSS 10.66%, 95th percentile). CISA KEV confirms active exploitation (added 2026-06-05) affecting SolarWinds / Serv-U. a weakness (CWE-400) Unauthenticated remote administrative access may be possible. EPSS rose +9.61% over the last day, indicating growing attacker interest. The CISA remediation deadline has passed—treat as an emergency patch priority.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

CISA KEV Record for CVE-2026-28318

Name: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability · CISA KEV detail

Exploit added: 2026-06-05

Action due: 2026-06-19

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

Exploit prediction scoring system (EPSS) score for CVE-2026-28318

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-23 1.05% 10.66% +9.61%
2 2026-06-15 6.26% 1.05% -5.21%
3 2026-06-12 — 6.26% —

Full EPSS history (7 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-28318

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]

Weakness enumeration for CVE-2026-28318

GitHub Security Advisory for CVE-2026-28318

GHSA-4vx4-vp54-mwmc · Severity: high — SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service...

Affected software / configurations for CVE-2026-28318

Vendor Product Version Raw CPE
solarwinds serv-u < 15.5.4 cpe:2.3:a:solarwinds:serv-u:*:*:*:*:*:*:*:*
solarwinds serv-u 15.5.4 cpe:2.3:a:solarwinds:serv-u:15.5.4:-:*:*:*:*:*:*

References for CVE-2026-28318

cvelogic Threat Intelligence