CVE-2021-33719
9.8 · CRITICALOverview
CVE-2021-33719 is a critical-severity vulnerability affecting siemens siprotec_5_with_cpu_variant_cp050. It was published on September 14, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from siemens. Update siprotec_5_with_cpu_variant_cp050 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| siemens | siprotec_5_with_cpu_variant_cp050 | >= 0, < 8.80 | Affected |
| siemens | siprotec_5_with_cpu_variant_cp100 | >= 0, < 8.80 | Affected |
| siemens | siprotec_5_with_cpu_variant_cp300 | >= 0, < 8.80 | Affected |
Frequently Asked Questions
What is CVE-2021-33719?
CVE-2021-33719 is a critical-severity vulnerability affecting siemens siprotec_5_with_cpu_variant_cp050. It was published on September 14, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2021-33719?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-33719?
Check the references section for vendor advisories and patches from siemens. Update siprotec_5_with_cpu_variant_cp050 to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-33719?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-33719 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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