CVE-2021-44693 : Security Advisory and Response
Learn about CVE-2021-44693 affecting Siemens devices. Details on the vulnerability, impacted systems, exploitation, mitigation steps, and patching advice.
Siemens devices are affected by a vulnerability that could allow an attacker to trigger a denial of service by sending crafted packets to port 102/tcp.
Understanding CVE-2021-44693
This CVE affects various Siemens products and versions, potentially leading to a denial of service scenario.
What is CVE-2021-44693?
The vulnerability arises from affected devices mishandling specially crafted packets on port 102/tcp, creating an opportunity for attackers to disrupt services.
The Impact of CVE-2021-44693
The vulnerability may be exploited remotely by a threat actor to induce a denial of service condition, impacting the availability of affected devices.
Technical Details of CVE-2021-44693
This section outlines the technical aspects of the CVE.
Vulnerability Description
The issue stems from affected devices incorrectly processing specific crafted packets, potentially leading to service disruption.
Affected Systems and Versions
- Siemens SIMATIC Drive Controller CPU 1504D TF: All versions < V2.9.7
- Siemens SIMATIC Drive Controller CPU 1507D TF: All versions < V2.9.7
- Other Siemens products listed with affected versions
Exploitation Mechanism
By sending specially crafted packets to port 102/tcp, threat actors can exploit this vulnerability to trigger a denial of service.
Mitigation and Prevention
Mitigation strategies and preventive measures to address CVE-2021-44693.
Immediate Steps to Take
- Apply patches or updates provided by Siemens promptly.
- Implement network segmentation to restrict access to vulnerable devices.
- Monitor network traffic for any signs of malicious activities.
Long-Term Security Practices
- Regularly update and patch all software and firmware on critical devices.
- Conduct security assessments and penetration testing to identify vulnerabilities proactively.
- Educate staff on cybersecurity best practices to enhance overall security posture.
Patching and Updates
Ensure timely installation of Siemens-provided patches and updates to mitigate the vulnerability effectively.