CVE-2021-31337

CRITICAL
9.8
CVSS Score
Published: June 28, 2021 at 12:24 PM UTC
Updated: June 17, 2026 at 03:51 AM UTC
7 products affected across 1 vendorSinamics SL150 FirmwareSinamics SM150 FirmwareSinamics SM150I Firmware

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Severity
CRITICAL9.8
Exploit prediction
EPSS 2%

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).

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions
siemens-sinamics-sl150 (same device)
All versions
siemens-sinamics-sm150 (same device)
All versions
siemens-sinamics-sm150i (same device)
All versions
All versions
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

x_refsource_MISCNot ApplicableThird Party AdvisoryUS Government Resource
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-04

CVSS

Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-306

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