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CVE-2021-31337The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may…

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).

Timeline

  1. ID reserved

    By siemens

  2. · 2 months later

    Published

  3. · 3 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2021-31337, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Critical9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
1.7% · top 23% of all CVEs (14 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.

Affected products

  • SINAMICS Medium Voltage Products

    • affected SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions

References

References1

Sources

The same CVE in the primary databases and aggregators, to check against.

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[![CVE-2021-31337](https://cveledger.app/badge/CVE-2021-31337.svg)](https://cveledger.app/cve/CVE-2021-31337)

Record last updated .