CVE-2021-33720

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.

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-2021-33720?: CVE-2021-33720 has been scored as a high severity vulnerability.
How to fix CVE-2021-33720?: To fix CVE-2021-33720, 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-2021-33720 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2021-33720 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-33720?: CVE-2021-33720 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.

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Description

Category

CWE-120 – Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

References

Frequently Asked Questions