CVE-2021-25676 Explained : Impact and Mitigation
Learn about CVE-2021-25676, a vulnerability in Siemens products RUGGEDCOM RM1224, SCALANCE M-800, S615, and SC-600. Multiple failed SSH authentication attempts could trigger a temporary Denial-of-Service.
A vulnerability has been identified in multiple Siemens products including RUGGEDCOM RM1224, SCALANCE M-800, SCALANCE S615, and SCALANCE SC-600. This vulnerability could lead to a temporary Denial-of-Service condition when triggered due to multiple failed SSH authentication attempts.
Understanding CVE-2021-25676
This section delves into the details of the CVE-2021-25676 vulnerability affecting Siemens products.
What is CVE-2021-25676?
CVE-2021-25676 is a vulnerability found in Siemens industrial products that may result in a temporary Denial-of-Service state through multiple failed SSH authentication attempts.
The Impact of CVE-2021-25676
The vulnerability in RUGGEDCOM RM1224, SCALANCE M-800, SCALANCE S615, and SCALANCE SC-600 could trigger a temporary Denial-of-Service condition, leading to an automatic device reboot.
Technical Details of CVE-2021-25676
This section provides deeper technical insights into the CVE-2021-25676 vulnerability.
Vulnerability Description
The vulnerability arises from improper restriction of excessive authentication attempts, allowing attackers to trigger a temporary Denial-of-Service.
Affected Systems and Versions
The affected products include RUGGEDCOM RM1224 (V6.3), SCALANCE M-800 (V6.3), SCALANCE S615 (V6.3), and SCALANCE SC-600 (All Versions >= V2.1 and < V2.1.3).
Exploitation Mechanism
Multiple failed SSH authentication attempts are needed to exploit the vulnerability and instigate a temporary Denial-of-Service condition.
Mitigation and Prevention
Understanding how to mitigate and prevent the risks associated with CVE-2021-25676 is crucial.
Immediate Steps to Take
It is recommended to monitor SSH authentication attempts and apply vendor-recommended patches and updates promptly.
Long-Term Security Practices
Enhancing network security measures, enforcing strong password policies, and regular security audits can help prevent such vulnerabilities.
Patching and Updates
Regularly check for security advisories from Siemens and apply patches as soon as they are released to safeguard against CVE-2021-25676.