CVE-2019-9509Network attack vector

Authenticated script execution via reflected POST input

Published Mar 30, 2020 · Updated Sep 16, 2024

Reflected XSS in Vertiv Avocent UMG 4000 4.2.1.19 allows remote authenticated users to execute scripts via an HTTP POST parameter. The web interface places user-controlled POST input into a rendered page without neutralizing script-capable content. A user account and victim interaction are required; execution occurs in the victim's browser and can expose session-readable data or perform permitted actions.

CVSS severity5.4
Medium
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in Vertiv Avocent UMG 4000 4.2.1.19 allows remote authenticated users to execute scripts via an HTTP POST parameter. The web interface places user-controlled POST input into a rendered page without neutralizing script-capable content. A user account and victim interaction are required; execution occurs in the victim's browser and can expose session-readable data or perform permitted actions.

The record

CVE
CVE-2019-9509
Published
Mar 30, 2020
Updated
Sep 16, 2024
Vendor
Vertiv
Product
Avocent UMG 4000
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 30, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.2.1.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Vertiv · Avocent UMG 4000version=4.2.1.19

Published CVSS scores

5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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