7.5
HIGH
CVE-2021-37172
Siemens SIMATIC S7-1200 Password Bypassing Vulnerability
Description

A vulnerability has been identified in SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (V4.5.0). Affected devices fail to authenticate against configured passwords when provisioned using TIA Portal V13. This could allow an attacker using TIA Portal V13 or later versions to bypass authentication and download arbitrary programs to the PLC. The vulnerability does not occur when TIA Portal V13 SP1 or any later version was used to provision the device.

INFO

Published Date :

Aug. 10, 2021, 11:15 a.m.

Last Modified :

Nov. 21, 2024, 6:14 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-37172 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Siemens simatic_s7-1200_cpu_firmware
2 Siemens simatic_step_7_\(tia_portal\)
3 Siemens simatic_s7-1200_firmware
4 Siemens cpu_1211c
5 Siemens cpu_1212c
6 Siemens cpu_1212fc
7 Siemens cpu_1214c
8 Siemens cpu_1214fc
9 Siemens cpu_1215c
10 Siemens cpu_1215fc
11 Siemens cpu_1217c
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-37172.

URL Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdf Patch Vendor Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdf Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-37172 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-37172 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdf
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Jul. 01, 2022

    Action Type Old Value New Value
    Added CPE Configuration OR *cpe:2.3:a:siemens:simatic_step_7_\(tia_portal\):*:*:*:*:*:*:*:* versions up to (including) 13.0
  • CVE Modified by [email protected]

    Sep. 14, 2021

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (V4.5.0). Affected devices fail to authenticate against configured passwords when provisioned using TIA Portal V13. This could allow an attacker using TIA Portal V17 or later versions to bypass authentication and download arbitrary programs to the PLC. The vulnerability does not occur when TIA Portal V13 SP1 or any later version was used to provision the device. A vulnerability has been identified in SIMATIC S7-1200 CPU family (incl. SIPLUS variants) (V4.5.0). Affected devices fail to authenticate against configured passwords when provisioned using TIA Portal V13. This could allow an attacker using TIA Portal V13 or later versions to bypass authentication and download arbitrary programs to the PLC. The vulnerability does not occur when TIA Portal V13 SP1 or any later version was used to provision the device.
  • Initial Analysis by [email protected]

    Aug. 20, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:P/A:N)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
    Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-830194.pdf Patch, Vendor Advisory
    Added CWE NIST CWE-287
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_s7-1200_cpu_firmware:4.5.0:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:cpu_1211c:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:cpu_1212c:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:cpu_1212fc:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:cpu_1214c:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:cpu_1214fc:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:cpu_1215c:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:cpu_1215fc:-:*:*:*:*:*:*:* cpe:2.3:h:siemens:cpu_1217c:-:*:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-37172 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.08 }} 0.01%

score

0.34168

percentile

CVSS31 - Vulnerability Scoring System
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