CVE-2021-33719 : Exploit Details and Defense Strategies
Discover the impact and mitigation strategies for CVE-2021-33719 affecting SIPROTEC 5 relays CP050, CP100, and CP300. Learn how attackers exploit the vulnerability and steps to secure affected systems.
A vulnerability has been identified in SIPROTEC 5 relays with CPU variants CP050, CP100, and CP300. Attackers can exploit this vulnerability by sending specially crafted packets to port 4443/tcp, leading to a Denial-of-Service condition or potential remote code execution.
Understanding CVE-2021-33719
This section provides insights into the impact and technical details of the CVE-2021-33719 vulnerability.
What is CVE-2021-33719?
The vulnerability exists in SIPROTEC 5 relays with CPU variants CP050, CP100, and CP300, where attackers can trigger a Denial-of-Service situation or potential remote code execution by sending malicious packets to port 4443/tcp.
The Impact of CVE-2021-33719
The impact of this CVE is significant as it allows threat actors to disrupt operations by causing a Denial-of-Service or potentially gain unauthorized remote access to affected systems.
Technical Details of CVE-2021-33719
This section outlines the vulnerability description, affected systems, versions, and the exploitation mechanism.
Vulnerability Description
The vulnerability stems from a lack of validation in handling incoming packets on port 4443/tcp, enabling threat actors to craft malicious packets leading to a Denial-of-Service condition or remote code execution.
Affected Systems and Versions
SIPROTEC 5 relays with CPU variants CP050, CP100, and CP300 are impacted by this vulnerability, specifically affecting all versions less than V8.80.
Exploitation Mechanism
By sending specially crafted packets to port 4443/tcp, threat actors can exploit this vulnerability to disrupt services or potentially execute malicious code on vulnerable systems.
Mitigation and Prevention
To safeguard systems against CVE-2021-33719, immediate steps, best security practices, and the importance of patching and updates are crucial.
Immediate Steps to Take
Organizations should consider implementing network filtering rules to block malicious packets targeting port 4443/tcp and restrict access to vulnerable systems.
Long-Term Security Practices
Regular security assessments, network monitoring, and timely security updates are essential to prevent potential exploitation of vulnerabilities.
Patching and Updates
It is recommended to apply the latest security patches provided by Siemens for SIPROTEC 5 relays to address the CVE-2021-33719 vulnerability.