Auth bypass in Siemens Sinamics Sl150
CVE-2021-31337
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).
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.1th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 76th percentile — 76.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Siemens Sinamics Sl150
- Siemens Sinamics Sl150 Firmware
- Siemens Sinamics Sm150
- Siemens Sinamics Sm150 Firmware
- Siemens Sinamics Sm150i
- Siemens Sinamics Sm150i Firmware
- Sinamics Medium Voltage Products — versions SINAMICS SL150: All versions, SINAMICS SM150: All versions, SINAMICS SM150i: All versions
Weakness classification (CWE)
Public proof-of-concept exploits
References
- us-cert.cisa.gov/ics/advisories/icsa-21-131-04 (US Government Resource, Third Party Advisory, Not Applicable)
Frequently asked questions
- What is CVE-2021-31337?
- CVE-2021-31337 is a critical-severity vulnerability in Siemens Sinamics Sl150, classified under Missing Authentication for Critical Function. CVSS score: 9.8/10. Published 2021-06-28.
- How severe is CVE-2021-31337?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-31337 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.