CVE-2019-9507: The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to command injection because t

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HIGH 8.3MITIGATE

CVE-2019-9507 is a high-severity flaw (CVSS 8.3) affecting avocent umg-4000 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to command injection because the application incorrectly neutralizes code syntax before executing. Since all commands within the web application are executed as root, this could allow a remote attacker authenticated with an administrator account to execute arbitrary commands as root.

Why this priority

High severity

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	8.3 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.2% (top 18%)
CISA exploited list	No
Weakness	CWE-95, CWE-77
Published	2020-03-30
Last modified	2026-06-17

Publisher (CNA): CERT/CC · Vendor: vertiv

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-03-30 22:15 UTCPublished CVE record published
2026-06-17 02:43 UTCUpdated Record last modified

vertiv avocent umg-4000 firmware MITIGATE

Affected: 4.2.1.19

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.2.1.19

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2019-9507?

avocent umg-4000 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2019-9507 being exploited?

CVE-2019-9507 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2019-9507 affect?

CVE-2019-9507 affects avocent umg-4000 firmware. Severity is high (CVSS 8.3). The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to command injection because the application incorrectly neutralizes code syntax before executing. Since all commands within the web application are executed as

How urgent is CVE-2019-9507?

Priority 50/100. High severity

Related CVEs

CVE-2019-9509 MEDIUM 6.3 MITIGATE The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to reflected XSS in an HTTP PO
CVE-2019-9508 MEDIUM 6.3 MITIGATE The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to stored XSS

References

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