title: Authentication Bypass Without Administrator Privilege
description: TN-5900 Series firmware version v3.3 and prior is vulnerable to improper-authentication vulnerability. This vulnerability arises from inadequate authentication measures implemented in the web API handler, allowing low-privileged APIs to execute restricted actions that only high-privileged APIs are allowed This presents a potential risk of unauthorized exploitation by malicious actors.
problem types: CWE-287 Improper Authentication
affected:
{
defaultStatus: unaffected
product: TN-5900 Series
vendor: Moxa
versions:
lessThanOrEqual: 3.3, status: affected, version: 1.0, versionType: custom
}
metrics:
cvssV3_1: [
attackComplexity: LOW
attackVector: NETWORK
availabilityImpact: HIGH
baseScore: 8.8
baseSeverity: HIGH
confidentialityImpact: HIGH
integrityImpact: HIGH
privilegesRequired: LOW
scope: UNCHANGED
userInteraction: NONE
vectorString: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
version: 3.1
]
format: CVSS
scenarios: GENERAL
solutions: Moxa has developed appropriate solution to address the vulnerability. The solution for affected products is shown below:
*  TN-5900 Series: Please upgrade to firmware v3.4 or higher.