CVE-2021-21002

HIGH

Phoenix Contact FL COMSERVER UNI <2.40 - DoS

Title source: llm

Description

In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.

References (1)

Scores

CVSS v3 7.5
EPSS 0.0033
EPSS Percentile 55.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Classification

CWE
CWE-772
Status published

Affected Products (2)

phoenixcontact/fl_comserver_uni_232\/422\/485_firmware < 2.40
phoenixcontact/fl_comserver_uni_232\/422\/485-t_firmware < 2.40

Timeline

Published Jun 25, 2021
Tracked Since Feb 18, 2026