CVE-2021-33720: High severity siemens siprotec 5 vulnerability
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.
Affected Software
Remediation
Event History
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.