CVE-2021-33719

Description

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 or potential remote code execution.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.56%
Vendor Advisory siemens.com
Affected: Siemens SIPROTEC 5 relays with CPU variants CP050
Affected: Siemens SIPROTEC 5 relays with CPU variants CP100
Affected: Siemens SIPROTEC 5 relays with CPU variants CP300
Published at:
Updated at:

References

Link Tags
https://cert-portal.siemens.com/productcert/pdf/ssa-847986.pdf patch vendor advisory

Frequently Asked Questions

What is the severity of CVE-2021-33719?
CVE-2021-33719 has been scored as a critical severity vulnerability.
How to fix CVE-2021-33719?
To fix CVE-2021-33719, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-33719 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-33719 is being actively exploited. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-33719?
CVE-2021-33719 affects Siemens SIPROTEC 5 relays with CPU variants CP050, Siemens SIPROTEC 5 relays with CPU variants CP100, Siemens SIPROTEC 5 relays with CPU variants CP300.
This platform uses data from the NIST NVD, MITRE CVE, MITRE CWE, First.org and CISA KEV but is not endorsed or certified by these entities. CVE is a registred trademark of the MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. CWE is a registred trademark of the MITRE Corporation and the authoritative source of CWE content is MITRE's CWE web site.
© 2025 Under My Watch. All Rights Reserved.