Home/CVE/The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authenticati
CVE

CVE-2021-31337

The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authenticati

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).

CRITICAL · CVSS 9.8 EPSS 0.00622
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-306Missing Authentication for Critical Function
▤

Affected Products & Versions

3
siemens sinamics sl150 firmwareall versions
siemens sinamics sm150 firmwareall versions
siemens sinamics sm150i firmwareall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · productcert@siemens.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD28 Jun 2021 · 01:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-04Not ApplicableThird Party AdvisoryUS Government Resource
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