title: Denial of Service in Phoenix Contact FL COMSERVER UNI products
description: In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.
problem types: CWE-772 Missing Release of Resource after Effective Lifetime
affected:
{
product: FL COMSERVER
vendor: Phoenix Contact
versions:
lessThan: 2.40, status: affected, version: UNI 232/422/485 (2313452), versionType: custom
lessThan: 2.40, status: affected, version: UNI 232/422/485-T (2904817), versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 7.5
baseSeverity: HIGH
confidentialityImpact: NONE
integrityImpact: NONE
privilegesRequired: NONE
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
version: 3.1
]
solutions: Upgrade to the latest firmware, fixed firmware includes versions >= 2.41.