CVE-2013-6920

Name: CVE-2013-6920
Creator: NVD / NIST
Published: 2013-12-07T00:55:04.147+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.23%

Last modified Jun 17, 2026

CVE-2013-6920 is a vulnerability of currently unknown severity. Siemens SINAMICS S/G controllers with firmware before 4.6.11 do not require authentication for FTP and TELNET sessions, which allows remote attackers to bypass intended access restrictions via TCP traffic to port (1) 21 or (2) 23.. EPSS estimates a 3.23% chance of exploitation in the next 30 days.

Description

Siemens SINAMICS S/G controllers with firmware before 4.6.11 do not require authentication for FTP and TELNET sessions, which allows remote attackers to bypass intended access restrictions via TCP traffic to port (1) 21 or (2) 23.

Metrics

EPSS Probability

3.23%

86.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Siemens	Sinamics S\/G Family Firmware	<= 4.6
Siemens	Sinamics G110	All versions
Siemens	Sinamics G110d	All versions
Siemens	Sinamics G120	All versions
Siemens	Sinamics G120c	All versions
Siemens	Sinamics G120d	All versions
Siemens	Sinamics G120p	All versions
Siemens	Sinamics G130	All versions
Siemens	Sinamics G150	All versions
Siemens	Sinamics G180	All versions
Siemens	Sinamics S110	All versions
Siemens	Sinamics S120	All versions
Siemens	Sinamics S120cm	All versions
Siemens	Sinamics S150	All versions

References

http://ics-cert.us-cert.gov/advisories/ICSA-13-338-01US Government Resource
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-742938.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-742938.pdf
http://ics-cert.us-cert.gov/advisories/ICSA-13-338-01US Government Resource
http://www.siemens.com/innovation/pool/de/forschungsfelder/siemens_security_advisory_ssa-742938.pdfVendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-742938.pdf

Timeline

Published: Dec 7, 2013
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-6920?

How severe is CVE-2013-6920?

Severity scoring for CVE-2013-6920 is pending analysis. The EPSS model estimates a 3.23% probability of exploitation in the next 30 days.

How do I fix CVE-2013-6920?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-6920?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST