CVE-2013-6920

highpriority · track · 41EPSS 0.032 · 88 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

3.23% (88th) EPSS

CVSS 10 · high

Is it mine?

17 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

MitigationSINAMICS S/G family firmwarecisa_csaf_ot
Siemens has produced a firmware update, SINAMICS S/G V4.6.11 and 4.7, which resolves this vulnerability. Asset owners and operators should contact Siemens customer support to acquire the update.

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.5–10

v2.010highAV:N/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 10 · impact 10

v2.010criticalAV:N/AC:L/Au:N/C:C/I:C/A:Csecondary · CISA US

v2.08.5highAV:N/AC:L/Au:N/C:C/I:C/A:C/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-287USprimaryCWE-592US

affected products (17)

Products and version ranges known to be affected.

Siemens SINAMICS S/G family firmware: <4.6.11all versionscisa_csaf_otUS
Siemens SINAMICS S/G family firmware< 4.6.11cisa_csaf_otUS
n/a n/a≤ n/aenisa_euvdEU
siemens sinamics g110all versionsnvdUScpe:2.3:h:siemens:sinamics_g110:*:*:*:*:*:*:*:*
siemens sinamics g110dall versionsnvdUScpe:2.3:h:siemens:sinamics_g110d:*:*:*:*:*:*:*:*
siemens sinamics g120all versionsnvdUScpe:2.3:h:siemens:sinamics_g120:*:*:*:*:*:*:*:*
siemens sinamics g120call versionsnvdUScpe:2.3:h:siemens:sinamics_g120c:*:*:*:*:*:*:*:*
siemens sinamics g120dall versionsnvdUScpe:2.3:h:siemens:sinamics_g120d:*:*:*:*:*:*:*:*
siemens sinamics g120pall versionsnvdUScpe:2.3:h:siemens:sinamics_g120p:*:*:*:*:*:*:*:*
siemens sinamics g130all versionsnvdUScpe:2.3:h:siemens:sinamics_g130:*:*:*:*:*:*:*:*
siemens sinamics g150all versionsnvdUScpe:2.3:h:siemens:sinamics_g150:*:*:*:*:*:*:*:*
siemens sinamics g180all versionsnvdUScpe:2.3:h:siemens:sinamics_g180:*:*:*:*:*:*:*:*
siemens sinamics s/g family firmware≤ 4.6nvdUScpe:2.3:o:siemens:sinamics_s\/g_family_firmware:*:*:*:*:*:*:*:*
siemens sinamics s110all versionsnvdUScpe:2.3:h:siemens:sinamics_s110:*:*:*:*:*:*:*:*
siemens sinamics s120all versionsnvdUScpe:2.3:h:siemens:sinamics_s120:*:*:*:*:*:*:*:*
siemens sinamics s120cmall versionsnvdUScpe:2.3:h:siemens:sinamics_s120cm:*:*:*:*:*:*:*:*
siemens sinamics s150all versionsnvdUScpe:2.3:h:siemens:sinamics_s150:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-13-338-01Siemens SINAMICS S/G Authentication Bypass Vulnerability2013-09-06icsa · cisa_csaf_otUS
This CSAF advisory was extracted from unstructured data and may contain inaccuracies. If you notice any errors, please reach out to the designated contact at CISA CSAF: central@cisa.dhs.gov

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2013-12-07modified 2026-06-17

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references (9)

External citations — patches, advisories, analysis.

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