7.5
HIGH
CVE-2021-33737
Siemens SIMATIC CP Denial of Service
Description

A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 Advanced (All versions < V3.3), SIPLUS NET CP 443-1 (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (All versions < V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.

INFO

Published Date :

Sept. 14, 2021, 11:15 a.m.

Last Modified :

April 11, 2023, 10:15 a.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

3.9
Affected Products

The following products are affected by CVE-2021-33737 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_cp_443-1_firmware
2 Siemens simatic_cp_443-1_advanced_firmware
3 Siemens siplus_net_cp_443-1_firmware
4 Siemens siplus_net_cp_443-1_advanced_firmware
5 Siemens simatic_cp_343-1_firmware
6 Siemens simatic_cp_343-1_advanced_firmware
7 Siemens simatic_cp_343-1_erpc_firmware
8 Siemens simatic_cp_343-1_lean_firmware
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-2021-33737.

URL Resource
https://cert-portal.siemens.com/productcert/pdf/ssa-549234.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-2021-33737 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-33737 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 [email protected]

    May. 14, 2024

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

    Apr. 11, 2023

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 Advanced (All versions), SIMATIC CP 443-1 Advanced (incl. SIPLUS variants) (All versions), SIPLUS NET CP 443-1 Advanced (All versions). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations. A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 (All versions < V3.3), SIMATIC CP 443-1 Advanced (All versions < V3.3), SIPLUS NET CP 443-1 (All versions < V3.3), SIPLUS NET CP 443-1 Advanced (All versions < V3.3). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.
    Added CVSS V3.1 Siemens AG AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • CVE Modified by [email protected]

    Jun. 14, 2022

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 Advanced (incl. SIPLUS variants) (All versions). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations. A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 Advanced (All versions), SIMATIC CP 443-1 Advanced (incl. SIPLUS variants) (All versions), SIPLUS NET CP 443-1 Advanced (All versions). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.
  • Modified Analysis by [email protected]

    Apr. 29, 2022

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

    Dec. 14, 2021

    Action Type Old Value New Value
    Changed Description A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 Advanced (incl. SIPLUS variants) (All versions). Sending a specially crafted packet to port 102/tcp of an affected device could cause a Denial-of-Service condition. A restart is needed to restore normal operations. A vulnerability has been identified in SIMATIC CP 343-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 Advanced (incl. SIPLUS variants) (All versions), SIMATIC CP 343-1 ERPC (All versions), SIMATIC CP 343-1 Lean (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 (incl. SIPLUS variants) (All versions), SIMATIC CP 443-1 Advanced (incl. SIPLUS variants) (All versions). Sending a specially crafted packet to port 102/tcp of an affected device could cause a denial of service condition. A restart is needed to restore normal operations.
  • Initial Analysis by [email protected]

    Sep. 28, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:C)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdf No Types Assigned https://cert-portal.siemens.com/productcert/pdf/ssa-549234.pdf Patch, Vendor Advisory
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_343-1_firmware:*:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp343-1:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_343-1_advanced_firmware:*:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp343-1_advanced:-:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_343-1_erpc_firmware:*:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_343-1_erpc:*:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_343-1_lean_firmware:*:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_343-1_lean:*:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_443-1_firmware:*:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_443-1:*:*:*:*:*:*:*:*
    Added CPE Configuration AND OR *cpe:2.3:o:siemens:simatic_cp_443-1_advanced_firmware:*:*:*:*:*:*:*:* OR cpe:2.3:h:siemens:simatic_cp_443-1_advanced:*:*:*:*:*:*:*:*
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.
Exploit Prediction

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

0.10 }} 0.01%

score

0.42310

percentile

CVSS31 - Vulnerability Scoring System
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