What is CVE-2021-33720?

CVE-2021-33720 is a vulnerability identified in SIPROTEC 5 relays with CPU variants CP050, CP100, and CP300. Specially crafted packets sent to port 4443/tcp could cause a DoS condition.

How does CVE-2021-33720 affect Siemens SIPROTEC 5 relays?

CVE-2021-33720 affects Siemens SIPROTEC 5 relays with CPU variants CP050, CP100, and CP300. It allows an attacker to cause a DoS condition by sending specially crafted packets to port 4443/tcp.

What is the severity of CVE-2021-33720?

The severity of CVE-2021-33720 is high, with a severity value of 7.5.

How do I fix CVE-2021-33720?

To fix CVE-2021-33720, Siemens recommends updating the affected SIPROTEC 5 relays to version 8.80 or higher.

Where can I find more information about CVE-2021-33720?

You can find more information about CVE-2021-33720 in the Siemens ProductCERT advisory at https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf.

Vulnerability/
CVE-2021-33720

high

7.5

CWE

120

14/9/2021

3/8/2024

CVE-2021-33720

First published: Tue Sep 14 2021(Updated: )

A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP100 (All versions < V8.80), SIPROTEC 5 relays with CPU variants CP300 (All versions < V8.80). Specially crafted packets sent to port 4443/tcp could cause a Denial-of-Service condition.

Credit: productcert@siemens.com

Affected Software	Affected Version	How to fix
Siemens SIPROTEC 5	<8.80
Siemens SIPROTEC 5 with CPU variant CP100	<8.80
Siemens SIPROTEC 5 with CPU variant CP300	<8.80

Remedy

https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf

Never miss a vulnerability like this again

Reference Links

https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf

Frequently Asked Questions

What is CVE-2021-33720?
CVE-2021-33720 is a vulnerability identified in SIPROTEC 5 relays with CPU variants CP050, CP100, and CP300. Specially crafted packets sent to port 4443/tcp could cause a DoS condition.
How does CVE-2021-33720 affect Siemens SIPROTEC 5 relays?
CVE-2021-33720 affects Siemens SIPROTEC 5 relays with CPU variants CP050, CP100, and CP300. It allows an attacker to cause a DoS condition by sending specially crafted packets to port 4443/tcp.
What is the severity of CVE-2021-33720?
The severity of CVE-2021-33720 is high, with a severity value of 7.5.
How do I fix CVE-2021-33720?
To fix CVE-2021-33720, Siemens recommends updating the affected SIPROTEC 5 relays to version 8.80 or higher.
Where can I find more information about CVE-2021-33720?
You can find more information about CVE-2021-33720 in the Siemens ProductCERT advisory at https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf.

agent/type
collector/mitre-cve
source/MITRE
agent/references
agent/weakness
agent/last-modified-date
agent/severity
agent/author
agent/remedy
agent/first-publish-date
agent/event
agent/description
agent/source
agent/softwarecombine
agent/tags
collector/nvd-index
agent/software-canonical-lookup-request
vendor/siemens
canonical/siemens siprotec 5
canonical/siemens siprotec 5 with cpu variant cp100
canonical/siemens siprotec 5 with cpu variant cp300

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