CVE-2021-31337

9.8 criticalEPSS 1.7%

Critical (9.8) in siemens. EPSS 1.7% chance of exploitation in the next 30 days.

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).

Severity

CVSS 3.1

9.8 critical

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

EPSS: 1.7% chance of exploitation in the next 30 days; higher than 76% of CVEs (scores of 2026-10-31)
CWE: CWE-306
Published: 2021-06-28
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

siemens:sinamics_sl150_firmware
siemens:sinamics_sm150_firmware
siemens:sinamics_sm150i_firmware

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-131-04
https://us-cert.cisa.gov/ics/advisories/icsa-21-131-04

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