CVE-2021-0297 : Vulnerability Insights and Analysis
Discover the impact of CVE-2021-0297, a vulnerability in Juniper Networks Junos OS Evolved that could lead to unauthorized BGP or LDP sessions, compromising network stability. Learn about affected versions and mitigation steps.
A vulnerability in the processing of TCP MD5 authentication in Juniper Networks Junos OS Evolved may allow unauthorized BGP or LDP sessions to be established, impacting network confidentiality and stability. Learn about the impact, affected versions, and mitigation steps below.
Understanding CVE-2021-20657
This CVE details a vulnerability in Juniper Networks Junos OS Evolved that could result in untrusted or unauthorized sessions being established due to improperly processed TCP MD5 authentication.
What is CVE-2021-20657?
The vulnerability allows BGP or LDP sessions configured with MD5 authentication to succeed, even if the peer lacks TCP MD5 authentication, leading to potential network security risks.
The Impact of CVE-2021-20657
The vulnerability could compromise the confidentiality or stability of affected networks, potentially allowing untrusted or unauthorized sessions to be established.
Technical Details of CVE-2021-20657
The vulnerability is rated with a CVSS v3.1 base score of 6.5, indicating a medium severity issue with low impacts on confidentiality and integrity, requiring no privileges for exploitation via a network attack vector.
Vulnerability Description
The vulnerability arises from improper processing of TCP MD5 authentication, enabling BGP or LDP sessions with MD5 authentication to succeed without peer authentication, risking network security.
Affected Systems and Versions
Juniper Networks Junos OS Evolved versions prior to 20.3R2-S1-EVO, 20.4R2-EVO, and 21.1R2-EVO are affected by this vulnerability.
Exploitation Mechanism
At present, there is no known malicious exploitation of this vulnerability identified by Juniper's SIRT team.
Mitigation and Prevention
To address CVE-2021-20657, immediate steps and long-term practices can enhance network security.
Immediate Steps to Take
Update affected software to versions 20.3R2-S1-EVO, 20.4R2-EVO, 21.1R2-EVO, 21.2R1-EVO, or subsequent releases provided by Juniper Networks to eliminate the vulnerability.
Long-Term Security Practices
Regularly update Junos OS Evolved software to stay protected from potential vulnerabilities and ensure network security.
Patching and Updates
Stay informed about security advisories from Juniper Networks and promptly apply patches or updates to mitigate known vulnerabilities.