PatchTheCVECVE-2019-9509: The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to reflected XSS in an HTTP PO
CVE-2019-9509 is a medium-severity flaw (CVSS 6.3) 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 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.
Why this priority
- No elevated risk signals yet
No fix is published yet: follow the downgrade or mitigation steps.
Risk facts
| CVSS score | 6.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | Required |
| EPSS exploit chance | 0.9% (top 40%) |
| CISA exploited list | No |
| Weakness | CWE-79 |
| Published | 2020-03-30 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
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-2019-9509?
avocent umg-4000 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.
Is CVE-2019-9509 being exploited?
CVE-2019-9509 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-2019-9509 affect?
CVE-2019-9509 affects avocent umg-4000 firmware. Severity is medium (CVSS 6.3). 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 coul
How urgent is CVE-2019-9509?
Priority 37/100. No elevated risk signals yet.
Related CVEs
- 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
- CVE-2019-9507 HIGH 8.3 MITIGATE The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to command injection because t