CVE-2021-31337 json
The Telnet service of the SIMATIC HMI Comfort Panels system component in affected products does not require authentication, which may allow…
published 2021-06-28 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-18247
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 77%
- public exploits
- 0
- none known
Summary
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).
Exploit prediction
1.68% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.8 | AV:N/AC:M/Au:N/C:P/I:P/A:P |
Affected products
- n/a SINAMICS Medium Voltage Products
Classification
- Weakness
-
- CWE-306 Missing Authentication for Critical Functionality
References
-
us-cert.cisa.gov
/ics/advisories/icsa-21-131-04
not-applicable, third-party-advisory, us-government-resource
Sources
- CVE List CVE-2021-31337
- NVD CVE-2021-31337
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