Actively exploitedCVSS 7.5 · HIGH

CVE-2026-28318

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.

View on NVD

Analysis

SolarWinds Serv-U es vulnerable a ataques de denegación de servicio que permiten a un atacante remoto colapsar el servicio sin necesidad de autenticación mediante peticiones POST maliciosas. Esta vulnerabilidad está siendo explotada activamente en entornos reales, por lo que es crítico actualizar la herramienta para evitar interrupciones en procesos de transferencia de archivos. Los atacantes aprovechan el manejo de encabezados específicos para agotar los recursos del servidor de manera inmediata.

Relevant roles

BackendCyberSecurityWindowsLinuxCloud

Severity

Score: 7.5(HIGH)

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

AV: NETWORK

AC: LOW

PR: NONE

UI: NONE

S: UNCHANGED

C: NONE

I: NONE

A: HIGH

Weakness (CWE): CWE-400

CISA KEV

Added to KEV: 2026-06-05

Federal patch deadline: 2026-06-19

Known ransomware use: Unknown

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.

EPSS

Probability of exploitation (next 30 days): 0.0006 (0.1%)

Percentile: 19.7%

EPSS: 2026-06-05

Affects

solarwinds:serv-u

Technical description

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: 6/4/2026, 3:16:50 PM

Last modified: 6/5/2026, 7:32:38 PM

References

How to read this card

Actively exploited

KEV (Known Exploited Vulnerabilities) is CISA's catalog of CVEs confirmed as actively exploited in the real world. If a CVE is on KEV, someone is already using it in attacks.

CVSS 10.0

CVSS 10.0 — máxima severidad teórica. Explotable de forma remota, sin privilegios, con impacto total. Aún no confirmada como explotada en el mundo real, pero parchea ya.

AI-recommended

Un modelo de lenguaje revisó el CVE y consideró que afecta a software ampliamente desplegado o herramientas comunes de desarrollo. Un humano del equipo aprobó la publicación antes de que llegara aquí.

Categorías de impacto que evalúa la IA

widely_deployed_infra — kernel Linux, OpenSSL, glibc, k8s, Docker, nginx, OpenSSH.

popular_dev_tooling — Node.js, Python, Go, React, Next.js, librerías comunes de npm/pip.

common_consumer_software — Chrome, Firefox, Windows, macOS, apps móviles populares.

enterprise_saas — GitHub, GitLab, Atlassian, Salesforce, Cisco, Fortinet, Ivanti.

niche_software — CMS regionales, herramientas de hobby, librerías de poco uso.

not_relevant — firmware específico de proveedor, software descontinuado.

EPSS — EPSS (Exploit Prediction Scoring System) by FIRST.org estimates the probability that a CVE will be exploited in the next 30 days. Range is 0 to 1; very fresh CVEs typically score low until evidence accumulates.