CVE-2021-31337
Last modified
CVE-2021-31337 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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).. EPSS estimates a 1.68% chance of exploitation in the next 30 days.
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).
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Siemens | Sinamics Sl150 Firmware | All versions |
| Siemens | Sinamics Sm150 Firmware | All versions |
| Siemens | Sinamics Sm150i Firmware | All versions |
References
- https://us-cert.cisa.gov/ics/advisories/icsa-21-131-04Not Applicable, Third Party Advisory, US Government Resource
- https://us-cert.cisa.gov/ics/advisories/icsa-21-131-04Not Applicable, Third Party Advisory, US Government Resource
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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