VULNERABILITY INTELLIGENCE

CVE-2021-31337

CVSS score9.8 CRITICAL

EPSS probability1.68%

CISA KEVNot currently listed

Published2021-06-28

Last modified2026-06-17

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow a remote attacker to gain access to the device if the service is enabled. Telnet is disabled by default on the SINAMICS Medium Voltage Products (SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions).

Weakness classification

productcert@siemens.com: CWE-306

Primary references

productcert@siemens.com — Not Applicable, Third Party Advisory, US Government Resource
af854a3a-2127-422b-91ae-364da2661108 — Not Applicable, Third Party Advisory, US Government Resource