What is CVE-2019-9509?

CVE-2019-9509 is a medium-severity vulnerability in Vertiv Avocent Umg-4000, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2020-03-30.

How severe is CVE-2019-9509?

Medium severity. CVSS v3 base score is 6.3 out of 10.

XSS in Vertiv Avocent Umg-4000

CVE-2019-9509

The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to reflected XSS in an HTTP POST parameter. The web application does not neutralize user-controllable input before displaying to users in a web page, which could allow a remote attacker authenticated with a user account to execute arbitrary code.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-03-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.009 (58.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Vertiv Avocent Umg-4000 — versions 4.2.1.19
Vertiv Avocent Umg-4000
Vertiv Avocent Umg-4000 Firmware — versions 4.2.1.19

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.vertiv.com/en-us/support/software-download/it-management/avocent-universal-… (Vendor Advisory)
www.vertiv.com/en-us/support/software-download/software/trellis-enterprise-and-… (Vendor Advisory)

Frequently asked questions

What is CVE-2019-9509?: CVE-2019-9509 is a medium-severity vulnerability in Vertiv Avocent Umg-4000, classified under Cross-site Scripting. CVSS score: 6.3/10. Published 2020-03-30.
How severe is CVE-2019-9509?: Medium severity. CVSS v3 base score is 6.3 out of 10.