title: The web interface of the Vertiv Avocent UMG-4000 version 4.2.1.19 is vulnerable to reflected cross site scripting
description: 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.
problem types: CWE-79 Cross-site Scripting (XSS)
affected:
{
product: Avocent UMG-4000
vendor: Vertiv
versions:
status: affected, version: 4.2.1.19
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: LOW
baseScore: 6.3
baseSeverity: MEDIUM
confidentialityImpact: LOW
integrityImpact: LOW
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: REQUIRED
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
version: 3.1
]
solutions: Vertiv Avocent has released patches for these vulnerabilities. Trellis customers of the UMG running firmware v4.2.0.23 that are operating Trellis v5.0.2 through 5.0.6 and all Non-Trellis UMG customers should install the update patch found  https://www.vertiv.com/en-us/support/software-download/it-management/avocent-universal-management-gateway-appliance--software-downloads/ . Trellis users of the UMG that are operating Trellis v5.0.6 and later should install Universal Gateway firmware version 4.3.0.23 found https://www.vertiv.com/en-us/support/software-download/software/trellis-enterprise-and-quick-start-solutions-software-downloads/ .