CVE-2021-44695 : What You Need to Know

CVE-2021-44695 affects Siemens devices, potentially leading to denial of service attacks.

Understanding CVE-2021-44695

What is CVE-2021-44695?

Siemens devices fail to handle specific crafted packets on port 102/tcp, opening the door for attackers to disrupt services.

The Impact of CVE-2021-44695

The vulnerability can be exploited to cause a denial of service, impacting the availability of affected Siemens devices.

Technical Details of CVE-2021-44695

Vulnerability Description

The issue arises from the incorrect processing of specially crafted packets on port 102/tcp, enabling attackers to trigger denial of service.

Affected Systems and Versions

Below are the affected Siemens products and their vulnerable versions:

SIMATIC Drive Controller CPU 1504D TF: All versions < V2.9.7
SIMATIC Drive Controller CPU 1507D TF: All versions < V2.9.7
SIMATIC ET 200SP Open Controller CPU 1515SP PC2: All versions < V21.9.7
SIMATIC S7-1200 CPU family: All versions < V4.6.0
Multiple SIMATIC S7-1500 CPU versions: All versions < V2.9.7
Various SIPLUS variants: All versions < V3.0.1

Exploitation Mechanism

Attackers send crafted packets to port 102/tcp to exploit this vulnerability.

Mitigation and Prevention

Immediate Steps to Take

Apply security patches provided by Siemens.
Implement network segmentation to contain potential attacks.
Monitor network traffic for signs of exploitation.

Long-Term Security Practices

Conduct regular security assessments and audits.
Keep systems up to date with the latest patches.
Educate staff on cybersecurity best practices.

Patching and Updates

Ensure all affected devices are updated with the latest security patches to mitigate the vulnerability.