Is CVE-2013-6920 actively exploited?

No active exploitation of CVE-2013-6920 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2013-6920 be exploited remotely?

Yes. CVE-2013-6920 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2013-6920?

CVE-2013-6920 has a CVSS score of 10.0 (CRITICAL).

HOME VULNERABILITIESCVE-2013-6920

CRITICAL

CVE-2013-6920

CWE-287Published: December 7, 2013· Updated: Jun 17, 2026

10.0

CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2013-6920 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges Req.

User Interaction

Scope

Impact

ConfidentialityC

IntegrityC

AvailabilityC

AV:N/AC:L/Au:N/C:C/I:C/A:C

Affected Vendors & Products

siemens14 product(s)

sinamics s\/g family firmwaresinamics g110sinamics g110dsinamics g120sinamics g120csinamics g120dsinamics g120psinamics g130sinamics g150sinamics g180sinamics s110sinamics s120+2

Source: NVD CPE · 14 total CPE entries